I have the same seats in my 91 RS also. I got them from ebay for about $350... I had to make brackets to mount the stock sliders to...They turned out great!
Have a 91 RS as well, but with a 350 swap. It has old school more cragar looking rims on it and these rims are inspirational but right now I'm struggling between keeping them on it to keep it of the era it was built (all 91 style build) or go with updated rims but if I were to go with rims like this, I would probably go 18's instead of 20's. Cheaper tires and not so much the large look. Yes I like it but not the direction I want to go with it. I have to figure out my back hatch lock mechanism. My buddy replaced the latch motor when he had the car but it still doesn't work.
Its a 4.1 in single din touchscreen stareo i found it on amozon for 74 dollars with the mounting bracket with the 40-gm10 gm antenna adapter at least im pretty sure it looks the same as tho one that in the car lol