Hi love the capri some vauxhall cars from the 90s had some nice recaros try ebay just type in recaro im sure you can get a nice set and back seat to match just uncover the seat rear cloth and retrim yours or if you want some retro vinyl look try corbeau seats or midland wheels...........Keep it old skool
http://www.midlandwheels.com/Shop/C-985-Seats

http://www.wwclassics.com/