It is not uncommon for both the generator end plates and the generator engine mounting bracket to get damaged over time. The holes get elongated by the 3/8" bolts especially if they aren't tightened properly.
If either the end plates or the mounting bracket holes are badly damaged, the generator pulley will not be inline with the crankshaft and water pump pulleys and that can cause belt noise as well as premature generator bearing wear.
The generators that were rebuilt by Bosch would come with new end plates, but since Bosch discontinued rebuilding them, it's hard to find decent replacements.
New mounting brackets are still available, and so are the mounting bracket rubber grommets.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502 hiperformanceautoservice.com or oldvolvosonly.com
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