[Jrileynova]

Desert Valley Auto Parts in Phoenix Arizona has lower glass run channel for the doors they have rust free parts look up dvap

 

[daveschevyparts]

One of the largest "Vintage" dismantlers in the country. www.dvap.com
Reviews on the operation vary - might want to do your research. The yard elicits a range of different emotions from different people.
I have walked their yard twice, a lot of off brand and large cars one will not find parts for in a catalog. A bit thin on "popular" 64-81 GM products. They are moving main yard farther N, out of Phoenix Metro, guessing a lot got crushed in the process.