hey all new to forum. seeking to buy a two door caddy from the late 70's and i have it down to the coupe deville and the eldorado barritz. can you all weigh in as to which you think i should buy? ive been seeking comparisons online but have not found any. thanks all hope everyone is healthy

I've got a 1977 Coupe Deville that I'm restoring with a friend, and the plastic in between the back bumper and the main body of the car is missing. I was wondering where I could find this particular part. Does anyone know where I could find a replacement? Also, would this part be necessary to...