I bought Goodmark 1/4's for my Nova and they were absoulty beautiful, I also bought a dynacorn deck lid for the same car and was so disappointed with it I fixed the original GM (lock hole). I bought my 1/4's about 5 years ago and have heard they changed hands since then but not sure. You might want an opinion from someone who has bought something recently from Goodmark.
I'm not sure they aren't all made in the same factory in China anyway. The only one I trust is AMD and they don't make everything yet. I did buy both bumpers for the 61 from them and they are great, even original weight steel. I got a Sherman lower front fender patch for the 61 and it wasn't even close, they were the only ones who listed it. I'd have been better off beating a coffee can into shape.
A cousin of mine makes cookware he travels Asia once year when we did his 70 a couple of years ago we were thinking of get a container of sheetmetal and selling off stuff cause he could’ve got a awesome deal on goodmark or dynacorn the company which i believe was in Taiwan was golden legion they made & sold both if I remember correctly. In my experience with either goodmark or dynacorn one piece fits perfect or one piece sucks! The left 1/4 went on great right side hung over the drop off and the trunk gap was a complete mess lol I just think they are hit or miss kinda like harbor freight tools.