Check out http://www.leatherseats.com/section.asp?sid=1
they sell leather interior kits but like all upholstery kits it's expensive from $579.00 to $999.00
Once you have replaced the damaged leather you'll want to make it last. You can go the custom seat cover route and get your front and back seats covered for $189.00 with https://www.exactseatcovers.com/
So you can cover the damaged seats with seat covers or you can fix up the seats with an upholstery kit but either way seat covers would be good to look into.