diff --git a/GameData/RP-1/Tree/identicalParts.cfg b/GameData/RP-1/Tree/identicalParts.cfg
index fbbf123bf74..cb5e70bbfdd 100644
--- a/GameData/RP-1/Tree/identicalParts.cfg
+++ b/GameData/RP-1/Tree/identicalParts.cfg
@@ -697,9 +697,10 @@
 @PART[ca_landv_orbiter_core]:FOR[xxxRP0] { %identicalParts = RO_surveyorCore,ca_landv_core,ca_landv_orbiter_core,rn_surveyor3 }
 @PART[rn_surveyor3]:FOR[xxxRP0] { %identicalParts = RO_surveyorCore,ca_landv_core,ca_landv_orbiter_core,rn_surveyor3 }
 @PART[RO_surveyorCore]:FOR[xxxRP0] { %identicalParts = RO_surveyorCore,ca_landv_core,ca_landv_orbiter_core,rn_surveyor3 }
-@PART[DIRECT_STS_tank]:FOR[xxxRP0] { %identicalParts = DIRECT_STS_tank,ET,RSBtankSTSET }
-@PART[ET]:FOR[xxxRP0] { %identicalParts = DIRECT_STS_tank,ET,RSBtankSTSET }
-@PART[RSBtankSTSET]:FOR[xxxRP0] { %identicalParts = DIRECT_STS_tank,ET,RSBtankSTSET }
+@PART[DIRECT_STS_tank]:FOR[xxxRP0] { %identicalParts = DIRECT_STS_tank,ET,RSBtankSTSET,ShuttleExtTank }
+@PART[ET]:FOR[xxxRP0] { %identicalParts = DIRECT_STS_tank,ET,RSBtankSTSET,ShuttleExtTank }
+@PART[RSBtankSTSET]:FOR[xxxRP0] { %identicalParts = DIRECT_STS_tank,ET,RSBtankSTSET,ShuttleExtTank }
+@PART[ShuttleExtTank]:FOR[xxxRP0] { %identicalParts = DIRECT_STS_tank,ET,RSBtankSTSET,ShuttleExtTank }
 @PART[RFTank-I]:FOR[xxxRP0] { %identicalParts = RFTank-I }
 @PART[RFTank-II]:FOR[xxxRP0] { %identicalParts = RFTank-II }
 @PART[RFTank-III]:FOR[xxxRP0] { %identicalParts = RFTank-III }
diff --git a/Source/Tech Tree/Parts Browser/data/SpaceShuttleSystem.json b/Source/Tech Tree/Parts Browser/data/SpaceShuttleSystem.json
index 859a18d21d0..67dcc32cd79 100644
--- a/Source/Tech Tree/Parts Browser/data/SpaceShuttleSystem.json	
+++ b/Source/Tech Tree/Parts Browser/data/SpaceShuttleSystem.json	
@@ -773,7 +773,7 @@
         "engine_config": "",
         "upgrade": false,
         "entry_cost_mods": "ShuttleSWT",
-        "identical_part_name": "",
+        "identical_part_name": "SWT",
         "module_tags": []
     },
     {