If you're on about swapping the leather bits of the door card, they are **** to do, tbh you'll probably need to plastic weld them back in, and be CAREFUL when you take the leather ones out, try and not drill the holes, as I battered my FR ones, but luckily I practiced on them first, drill went straight through lol. I'd suggest you practice on the lcr ones as they will have no resale value any way. Mine are held in with aluminium tape and grip fill for the moment, until I can be bothered to weld them in.
Cheers for the info mate