See Post #2 ^^
The only kit you'll find is the vacuum hoses kit made by Carl at 928 Motorsports, but there is much more than that involved. "ALL" Rubber needs to be replaced, O-Rings, etc. Don't remember any gaskets, but it's been awhile. Plus I like Red RTV as nothing get's past that, even oil
...then while you got the Intake apart, get to all your rubber fuel hoses as well. There's a write up in the "Common Fixes" Thread.
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior
1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**