I use a lot of goodmark panels and very happy with it. It all needs work to be perfect. I couldn't get full goodmark cuda quarters last summer and used amd... they did not fit right to the original deck filler. Also thicker than oem which can be an issue also. Goodmark floors from rockauto are less than half of amd and same thickness as oem.
68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
99 Trans Am, 66 GTO, 06 Magnum RT AWD