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early and late arms both use 21" axles. i had a set of early arms on my bug first and then switched to late. there is a thread on here somewhere with good detail and pics as i was going through it. the difference in the width between the arms occurs at the hub. compare a rotor for a early and late and you will see what i mean. in fact, there is also a pic somewhere on here where i stacked the two arms and took some pics.
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