the spoilers had the same manufacturer Chrysler Corp VS. FoMoCo (FoMoCo used several different spoilers on different cars)

1969 Cougar Eliminator 31" pedestals
1969-70 Mustang 36" pedestals
1970 Cyclone 36" pedestals
1971-73 mustang 31" or 33" ??? I don't remember
1970-71 MOPAR all 36"

the '70 Mustang spoiler & MOPAR spoiler are identical with the exception of the part number inside the pedestal

the original '69 FoMoCo spoilers were prone to splitting on the seams and warping

most reproduction "fins" are "FAT" compared to originals