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I had purchased for a ecx amp. It was one of the hop up upgrades. They don't fit. The wheel pins would not fit in hex and when I finally found smaller pins they would not meet up with bearings properly. Allowing the distance between hex and bearing being over 2 mms. There is a design flaw somewhere. In fact this line of vehicles has been nothing but disappointment. Parts never fit right regardless who makes them. Wish I had bought traumas the first time. I went cheap and payed for it.