I got mine from Exploria.
Also, OEM covers are available from Inka-Corp on Ebay if you cannot get a matching seat.
Mine was a basic captains seat - no heated elements or air bags, so 8 nuts to undo and 4 to do up. There will be two visible holes in the the flooring and you can get inexpensive plastic bungs from ebay.
The only other thing I’ve done is add arm rests (ebay Cali Campers) which makes them super comfy.
Regards
Ian