If it's the original car then the culprit is likely to be an out of round centre pulley. The moulding company got the original drive pulleys a touch out of round, but it's enough to not allow you to get consistant tensions i.e. tight/slack spots which promotoes belt skip at the drive pulley.
Solutions are either the DDP (or the new ones that are standard) or a quick and easy fix is a xx4 rear belt layshaft pulley which fits one with only a little shimming needed. Be sure to gear down 1 tooth on your pinion if you do this though as the pulley is 1 tooth bigger.
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