Convertible seat frames are hard to find and are usually expensive. If you already have the top part,you may be able to cut down a hardtop lower section to fit. I have the one from my wifes car in my loft. I could probably give you the demensions of it on Sunday. I'll be out in the garage then.

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