are spark plug wires interchangeable with other years and models of the car. on 1991 Audi 90

I need one wire for my Audi 90 and I can't buy a set. It the core wire.

Asked by for the 1991 Audi 90
Look at ,they usually have good images of parts, see if the part number crosses over to any other car.
1 more answer
Your local parts store should have a breakdown of what is required for each wire in a set or take old one in and they can match.