Maybe the front but the P5s didn't have seat back pockets and the P5 and sedan rear seats do not interchange. Those look like custom covered seats, probably a dealership job or it was done early in the car's life. Can't tell if the doors have been covered in leather as well.
Went to a meet last night and got into a couple friendly pulls with a modded 6th gen Golf GTI. He was alone and I had one passenger and on 11psi we were neck and neck, neither of us pulled one each other for both runs. He said he was running 18psi and making about 260-275 at the crank... Seemed like a cool guy, he was either full of s*** or my car makes more power than I originally thought. I could tell he was surprised and a little disheartened when I popped the hood to show him it was just an MSP with the stock original drivetrain and turbo pushing 170k miles.