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

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I need one wire for my Audi 90 and I can't buy a set. It the core wire.
(2) Answers
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Look at ,they usually have good images of parts, see if the part number crosses over to any other car.
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.