OPG has just as much stuff. So I thought Ames didn't have much stuff for GTOs, and so just today I finally downloaded the Ames GTO catalog. I'm impressed to say the least. They have some of the stuff that OPG can't get. And it looks like the parts are quality from the pictures. Not to mention every Ames part in the catalog is a little bit cheaper than OPG. Looks like I'll give them a try on some little stuff before totally conveting all my parts purchases.
Now I do like the quality of about 80% of OPG's stuff, but they have problems with suppliers occasionally. I waited 3 months for a hood latch, when I finally just pulled the old one apart cleaned it, changed out the old springs, made a couple of new tack welds, and put that one back in. Still rough, but it works. About 6 months after that, the new latch came in. They also sent me two of the same side door weatherstrip. Other than that all good. Like the interior material quality, excellent. Oh and don't bother with their help line, customer service on there is kinda sorry.
Ames on the other hand, I haven't heard anything bad yet. I say yet because everyone I've talked to so far has used OPG. So I would say, buy a couple of little parts, like one electrical part and one mechanical part, see how they work then if those are good quality, go for it. Cause thats what I'm going to do.