i think a lot of it is a crapshoot
and what combination of parts you are using together matters also.
i had a hell of a time getting a AMD dutchman to fit good.
i messed with it for way too long and was never happy how it layed out.
it just had this warp that would not fit the contour of the rear window
pull it in and it popped out somewhere else.
pull it in too much and its bowed in the middle
i learned a few new curse words from it.. lol

i just happened to have a goodmark one in my parts stash that i didn't use
on a different project
the light went off in my head and i dug it out and tried it
and i got it to fit where i was happy and it didn't take very long
to do it either.
i had wasted much more more time on the other one then the complete install
of the 2nd.

good to know that the 70 stuff works
i have a 70 that needs everything back except the rails
i have a mint used tail panel,AMD trunk floor,goodmark dutchman
and a custom hand built rear cross member (very nice piece i must say)
that was built because the person wasn't very happy with the AMD part
so he banged out a dozen as he need a few for his project cars.
i have skins for the quarters but i'm probably going full quarters
after looking at it the other day.