16v injector guide question

ive got a cracked injector guide in my lower 50mm inlet manifold from my kr (copper tube thing). just wondering where i mite get one? have try'd gsf, vw, eurocar parts and so far come up with nothing.
am i right in saying that the later manifolds had plastic guides? or are these only on abf lumps? 

034133555A, 5.05+VAT from VW