The AMD floor pan fits well,and since the cars are indeed unitized construction,you want to get the sturdiest part possible. The AMD floor pan is made of heavier guage metal than the others on the market,for the difference in price,it is worth it to have a stronger piece.

70 Charger R/T SE 472 Hemi 70 Charger R/T convertible 70 Charger R/T V Code Sixpack 69 Charger R/T SE Sunroofcar 68 Charger 383 68 Charger 318 71 Charger R/T 70 Challenger convertible 71 Challenger convertible 71 Cuda 340 09 Challenger R/T Classic