diff --git a/src/el/el_launcher.star b/src/el/el_launcher.star
index def5f27fd..577bdb6e7 100644
--- a/src/el/el_launcher.star
+++ b/src/el/el_launcher.star
@@ -25,6 +25,7 @@ def launch(
     num_participants,
     port_publisher,
     mev_builder_type,
+    mev_params,
 ):
     el_launchers = {
         constants.EL_TYPE.geth: {
@@ -77,6 +78,7 @@ def launch(
                 jwt_file,
                 network_params.network,
                 builder_type=mev_builder_type,
+                mev_params=mev_params,
             ),
             "launch_method": reth.launch,
         },
diff --git a/src/el/reth/reth_launcher.star b/src/el/reth/reth_launcher.star
index 2c17f09aa..2ad8e3ac0 100644
--- a/src/el/reth/reth_launcher.star
+++ b/src/el/reth/reth_launcher.star
@@ -234,7 +234,7 @@ def get_config(
         launcher.builder_type == constants.FLASHBOTS_MEV_TYPE
         or launcher.builder_type == constants.COMMIT_BOOST_MEV_TYPE
     ):
-        image = constants.DEFAULT_FLASHBOTS_BUILDER_IMAGE
+        image = launcher.mev_params.mev_builder_image
         cl_client_name = service_name.split("-")[4]
         cmd.append("--engine.experimental")
         cmd.append("--rbuilder.config=" + flashbots_rbuilder.MEV_FILE_PATH_ON_CONTAINER)
@@ -283,10 +283,13 @@ def get_config(
     return ServiceConfig(**config_args)
 
 
-def new_reth_launcher(el_cl_genesis_data, jwt_file, network, builder_type=False):
+def new_reth_launcher(
+    el_cl_genesis_data, jwt_file, network, builder_type=False, mev_params=None
+):
     return struct(
         el_cl_genesis_data=el_cl_genesis_data,
         jwt_file=jwt_file,
         network=network,
         builder_type=builder_type,
+        mev_params=mev_params,
     )
diff --git a/src/participant_network.star b/src/participant_network.star
index 3b4da3cd5..f1a433ffe 100644
--- a/src/participant_network.star
+++ b/src/participant_network.star
@@ -141,6 +141,7 @@ def launch_participant_network(
         num_participants,
         args_with_right_defaults.port_publisher,
         args_with_right_defaults.mev_type,
+        args_with_right_defaults.mev_params,
     )
 
     # Launch all consensus layer clients