FFS! I wrote a very long post listing all the sources and links for seat parts and when I hit post it had logged me out here and I lost everything. FRIGGINFRASSANRAMANASS!
In short, it appears that all the other places on Ebay (Tanraz's warehouse and Legendary Auto Interiors etc) merely order from Parts Unlimited Inc (PUI) who appear to make ALL the seat parts but do not sell directly to the public. It also appears that we want the 77'-80' Camaro LT Custom ones with the flat top and the Vega guys want the 'standard' Camaro ones with the round tops. Is that correct Oh Ye-Blaster-of-The-Ducks (they musta deserved it eh)?
Also check out ; http://automotiveinteriors.com/seatcovers_unlimited.htm
- you can actually input a Monza or Skyhawk etc there. I am also currently waiting for fabric samples from SMS Auto Fabrics which appears very good; http://www.smsautofabrics.com/results.p ... =L&rpp=300
Foam parts are available at Classic and it also appears that rear bench/hatchback seats covers and foam are there also.
An excellent find by DuckBlaster indeed.