i think the ones that came on it are the upgraded one they are aluminum and have 2 V type springs. i'm thinking the springs don't have enough tension on them but haven't got a clue where to get replacement springs. when my clutch bell disintegrated it left some scoring on the shoes so will probably want to replace them at some point and figured it might be worth upgrading the clutch shoes for a better quality set possibly by a different manufacturer

not sure if anyones already listed this but it's a great store for acme parts in the uk [link]http://www.sriremotetoys.co.uk/[/link]