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Where did you get them? I bought a set from Dr. Rebuild and they have worked fine for the last 3 years.
I'm sure you can use the metal ones from 77(?) to 79(early). Just paint them to match the trim. In fact, I think your experience was a driver for GM to change to metal tabs back in the '70s.
A set of 3 for ~$15 is worth it.
http://www.ecklers.com/product.asp?pf_id=A3279&dept_id=1690