Another source of ratings is the Pelican Parts online catalog. They try to rate suppliers for quality. In my opinion, it might not be perfect, but seems worth a look.

For exhaust hanger donuts, Bruss is listed as a good brand. I don't have any personal experience with them yet, but will probably try them out in the near future. WOCO is supposed to be another good brand.

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Marshall Welch
Seattle, WA
1982 300D-T