The Goodmark stuff used to be the best repro stuff on the market, but they quit producing Ford stuff and started concentrating on the Chevy stuff. I'm surprised anyone has any of it left, as Goodmark quit the Ford stuff about 9 years ago, IIRC.
Nowadays, the Ford Tooling stuff is available and probably the best stuff out there, although, I don't have any experience with the Dynacorn stuff. The Ford Tooling stuff, though, is pretty darned good.
I have been pricing out sheet metal for my car and I noticed on the Good mark sight that the inner wheel fender combo was 60 bucks higher than the 2 sold separately is there a big advantage either way for them ? I haven't got into it yet but I will be needing a lot of different pieces back there. I guess I am wondering how well the stuff will fit or at least what to expect when trying to install the metal.
I just googled Goodmark and Dynacorn and found several discussion forums in which the consensus is that both use the same company in Taiwan to stamp the parts, ie, one dude in Taiwan with one press is stamping out 67 Mustang fenders, and some go in a Goodmark box and some go in a Dynacorn box. Up for debate was a statement that Goodmark gets first dibs on the best stampings and Dynacorn and some other company called Legion something or other gets second dibs.
I saw statements that both companies products were good and fit great, and complaints of Dynacorn fenders being wavy and Goodmark fenders being wavy. If they are indeed all coming from the same stamp, my bet is they are the same regardless of whose name is on the label.