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I'm in the process of restoring 1 "a" chassis rc10 and putting another "b" chassis runner togeather, while doing so I noticed that the arms for the "a" chassis are shorter where the hinge pin goes through and it requires a shorter hinge pin, was there a running design change using the same part#'s for the rear arms or are they different p/n's and if so what p/n goes to which?

Thanks,

I believe there was a running change. The newer versions use the shorter pins.

I used shorter 10T pins on mine with the later buggy arms, they're a different part number. Are the short pin arms black? An A chassis car should have the long pin arms standard.

no, my short pin arms are white.

Your short pin white arms are correct for a later RC10 CE - and I think they only came on cars with the Stealth trans.
Your A chassis needs standard long pin white arms (fairly easy to find).