You could just buy some MK1 adapter subframes.
Recaro Seats - VW Golf Mk1 Direct Fit Sub-frames - GSM Sport Seats - Bucket seats, racing seats, motorsport seats, roll cages and harnesses
Planted Seat Bracket Driver (Left) Side VW MK1 Jetta Rabbit Scirocco Golf Black | eBay
Planted Seat Bracket Passenger (Right) Side VW MK1 Jetta Rabbit Scirocco Golf | eBay
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