I put 73 buckets in my 71 RR bench seat car.
You will need to drill new holes and reinforce underneath.
It will look great and buckets are much more comfortable.

Just take your time to locate the seats left to right. I'm pretty sure the hump in not exactly in the middle.
The driver side has more room.
Look at some stock 71-72 RR or Charger's with buckets and eyeball the location or measure location from door sill to seat frame on both sides and you should be close.

Anyone else?

I just don't remember the details anymore.