diff --git a/simulators/history/portal-interop/Cargo.toml b/simulators/history/portal-interop/Cargo.toml
index 8ed17a5d..da64a7f8 100644
--- a/simulators/history/portal-interop/Cargo.toml
+++ b/simulators/history/portal-interop/Cargo.toml
@@ -6,6 +6,7 @@ edition = "2021"
 
 [dependencies]
 ethportal-api = { git = "https://github.com/ethereum/trin", rev = "2a32224e3c2b0b80bc37c1b692c33016371f197a" }
+portal-spec-test-utils-rs = { git = "https://github.com/ethereum/portal-spec-tests", rev = "d1e996d0d4dc2136b3cd38d9e25cdc3a6b74dcd9" }
 hivesim = { path = "../../../hivesim-rs" }
 itertools = "0.10.5"
 serde_json = "1.0.87"
diff --git a/simulators/history/portal-interop/src/constants.rs b/simulators/history/portal-interop/src/constants.rs
index 184c3af7..f0401543 100644
--- a/simulators/history/portal-interop/src/constants.rs
+++ b/simulators/history/portal-interop/src/constants.rs
@@ -1,11 +1 @@
-// Execution Layer hard forks https://ethereum.org/en/history/
-pub const SHANGHAI_BLOCK_NUMBER: u64 = 17034870;
-pub const MERGE_BLOCK_NUMBER: u64 = 15537394;
-pub const LONDON_BLOCK_NUMBER: u64 = 12965000;
-pub const BERLIN_BLOCK_NUMBER: u64 = 12244000;
-pub const ISTANBUL_BLOCK_NUMBER: u64 = 9069000;
-pub const CONSTANTINOPLE_BLOCK_NUMBER: u64 = 7280000;
-pub const BYZANTIUM_BLOCK_NUMBER: u64 = 4370000;
-pub const HOMESTEAD_BLOCK_NUMBER: u64 = 1150000;
-
 pub const TEST_DATA_FILE_PATH: &str = "./test-data/test_data_collection_of_forks_blocks.yaml";
diff --git a/simulators/history/portal-interop/src/main.rs b/simulators/history/portal-interop/src/main.rs
index a1371342..695ba70f 100644
--- a/simulators/history/portal-interop/src/main.rs
+++ b/simulators/history/portal-interop/src/main.rs
@@ -1,10 +1,6 @@
 mod constants;
 
-use crate::constants::{
-    BERLIN_BLOCK_NUMBER, BYZANTIUM_BLOCK_NUMBER, CONSTANTINOPLE_BLOCK_NUMBER,
-    HOMESTEAD_BLOCK_NUMBER, ISTANBUL_BLOCK_NUMBER, LONDON_BLOCK_NUMBER, MERGE_BLOCK_NUMBER,
-    SHANGHAI_BLOCK_NUMBER, TEST_DATA_FILE_PATH,
-};
+use crate::constants::TEST_DATA_FILE_PATH;
 use ethportal_api::types::portal::ContentInfo;
 use ethportal_api::utils::bytes::hex_encode;
 use ethportal_api::{
@@ -15,6 +11,7 @@ use hivesim::{
     dyn_async, Client, NClientTestSpec, Simulation, Suite, Test, TestSpec, TwoClientTestSpec,
 };
 use itertools::Itertools;
+use portal_spec_test_utils_rs::get_flair;
 use serde_json::json;
 use serde_yaml::Value;
 use tokio::time::Duration;
@@ -130,28 +127,6 @@ fn process_content(
     result
 }
 
-fn get_flair(block_number: u64) -> String {
-    if block_number > SHANGHAI_BLOCK_NUMBER {
-        " (post-shanghai)".to_string()
-    } else if block_number > MERGE_BLOCK_NUMBER {
-        " (post-merge)".to_string()
-    } else if block_number > LONDON_BLOCK_NUMBER {
-        " (post-london)".to_string()
-    } else if block_number > BERLIN_BLOCK_NUMBER {
-        " (post-berlin)".to_string()
-    } else if block_number > ISTANBUL_BLOCK_NUMBER {
-        " (post-istanbul)".to_string()
-    } else if block_number > CONSTANTINOPLE_BLOCK_NUMBER {
-        " (post-constantinople)".to_string()
-    } else if block_number > BYZANTIUM_BLOCK_NUMBER {
-        " (post-byzantium)".to_string()
-    } else if block_number > HOMESTEAD_BLOCK_NUMBER {
-        " (post-homestead)".to_string()
-    } else {
-        "".to_string()
-    }
-}
-
 dyn_async! {
    async fn test_portal_interop<'a> (test: &'a mut Test, _client: Option<Client>) {
         // Get all available portal clients
diff --git a/simulators/history/trin-bridge/Cargo.toml b/simulators/history/trin-bridge/Cargo.toml
index beba18b1..79c01963 100644
--- a/simulators/history/trin-bridge/Cargo.toml
+++ b/simulators/history/trin-bridge/Cargo.toml
@@ -6,6 +6,7 @@ edition = "2021"
 
 [dependencies]
 ethportal-api = { git = "https://github.com/ethereum/trin", rev = "b530dc3d40d51c21c800089eacb2852ebd8c4d45" }
+portal-spec-test-utils-rs = { git = "https://github.com/ethereum/portal-spec-tests", rev = "d1e996d0d4dc2136b3cd38d9e25cdc3a6b74dcd9" }
 hivesim = { path = "../../../hivesim-rs" }
 itertools = "0.10.5"
 serde_yaml = "0.9"
diff --git a/simulators/history/trin-bridge/src/constants.rs b/simulators/history/trin-bridge/src/constants.rs
index 2fa17457..2679b06b 100644
--- a/simulators/history/trin-bridge/src/constants.rs
+++ b/simulators/history/trin-bridge/src/constants.rs
@@ -1,13 +1,3 @@
-// Execution Layer hard forks https://ethereum.org/en/history/
-pub const SHANGHAI_BLOCK_NUMBER: u64 = 17034870;
-pub const MERGE_BLOCK_NUMBER: u64 = 15537394;
-pub const LONDON_BLOCK_NUMBER: u64 = 12965000;
-pub const BERLIN_BLOCK_NUMBER: u64 = 12244000;
-pub const ISTANBUL_BLOCK_NUMBER: u64 = 9069000;
-pub const CONSTANTINOPLE_BLOCK_NUMBER: u64 = 7280000;
-pub const BYZANTIUM_BLOCK_NUMBER: u64 = 4370000;
-pub const HOMESTEAD_BLOCK_NUMBER: u64 = 1150000;
-
 pub const TRIN_BRIDGE_CLIENT_TYPE: &str = "trin-bridge";
 pub const BOOTNODES_ENVIRONMENT_VARIABLE: &str = "HIVE_BOOTNODES";
 pub const HIVE_CHECK_LIVE_PORT: &str = "HIVE_CHECK_LIVE_PORT";
diff --git a/simulators/history/trin-bridge/src/main.rs b/simulators/history/trin-bridge/src/main.rs
index 1fcf3873..af42c41d 100644
--- a/simulators/history/trin-bridge/src/main.rs
+++ b/simulators/history/trin-bridge/src/main.rs
@@ -1,10 +1,8 @@
 mod constants;
 
 use crate::constants::{
-    BERLIN_BLOCK_NUMBER, BOOTNODES_ENVIRONMENT_VARIABLE, BYZANTIUM_BLOCK_NUMBER,
-    CONSTANTINOPLE_BLOCK_NUMBER, HIVE_CHECK_LIVE_PORT, HOMESTEAD_BLOCK_NUMBER,
-    ISTANBUL_BLOCK_NUMBER, LONDON_BLOCK_NUMBER, MERGE_BLOCK_NUMBER, SHANGHAI_BLOCK_NUMBER,
-    TEST_DATA_FILE_PATH, TRIN_BRIDGE_CLIENT_TYPE,
+    BOOTNODES_ENVIRONMENT_VARIABLE, HIVE_CHECK_LIVE_PORT, TEST_DATA_FILE_PATH,
+    TRIN_BRIDGE_CLIENT_TYPE,
 };
 use ethportal_api::HistoryContentKey;
 use ethportal_api::HistoryContentValue;
@@ -13,32 +11,11 @@ use ethportal_api::{Discv5ApiClient, HistoryNetworkApiClient};
 use hivesim::types::ClientDefinition;
 use hivesim::{dyn_async, Client, Simulation, Suite, Test, TestSpec, TwoClientTestSpec};
 use itertools::Itertools;
+use portal_spec_test_utils_rs::get_flair;
 use serde_yaml::Value;
 use std::collections::HashMap;
 use tokio::time::Duration;
 
-fn get_flair(block_number: u64) -> String {
-    if block_number > SHANGHAI_BLOCK_NUMBER {
-        " (post-shanghai)".to_string()
-    } else if block_number > MERGE_BLOCK_NUMBER {
-        " (post-merge)".to_string()
-    } else if block_number > LONDON_BLOCK_NUMBER {
-        " (post-london)".to_string()
-    } else if block_number > BERLIN_BLOCK_NUMBER {
-        " (post-berlin)".to_string()
-    } else if block_number > ISTANBUL_BLOCK_NUMBER {
-        " (post-istanbul)".to_string()
-    } else if block_number > CONSTANTINOPLE_BLOCK_NUMBER {
-        " (post-constantinople)".to_string()
-    } else if block_number > BYZANTIUM_BLOCK_NUMBER {
-        " (post-byzantium)".to_string()
-    } else if block_number > HOMESTEAD_BLOCK_NUMBER {
-        " (post-homestead)".to_string()
-    } else {
-        "".to_string()
-    }
-}
-
 fn process_content(content: Vec<(HistoryContentKey, HistoryContentValue)>) -> Vec<String> {
     let mut last_header = content.get(0).unwrap().clone();