Audi 80 Tdi

has anyone got and idea where I can get a diesel injector repair seals kit from? I live in the UK, my car is an Audi 80 Avant Tdi. with the fly by wire set up
The leak I've got is from the upper seal/gasket just above the main body of the pump. I know it's an easy fix but trying to locate a decent diesel specialist or garage who can supply the parts is what I need

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