I looked at the trunk floors in the Goodmark catalog and it looks like Cudas have 2 extra holes. It looks like the holes at Delta 1 are not on Challengers.
1970 Challenger R/T 440-4 Auto
2000 Ram Quad Cab 4x4 360 Auto
1973 Dodge 1/2 ton 4x4 318 Auto
1995 Dodge Dakota 4x4 318 Auto