As far as I know, the repop 'Maro fenders are identical except for the leading edge. That edge needs about 1" +/- trimmed off due to the different front bumper mounting on a 'Maro.
I used Dynamark inners on my coupe, and Goodmark on my '67 'vert, and both fit very well without any mods.
Maybe check to see what brand repops you recieved. May be cheap crap from China or Tiawan??
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold 1980 T/A SE Bandit - Sold