As far as I know the 501 and 511 use the same screws and fixings. The thread is standard 3mm but the balls are an odd size, being larger than the other makes. I converted to HotBodies D4 ballstuds which have the same thread and use standard size ball cups (Associated, ect). If you search the forum there's the part numbers for the two packs you need to convert the car.
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Mark Dyson
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