VW Part number 341 941 315 (part 55 in the below diagram)
T34 owners are in luck with replicating this type of gasket because it can be cut from a sheet of flat rubber! Find a sheet that is approximately 2mm thick and use the dimensions on the above right diagram to make it.
A couple of tips:
- Use a very soft sheet of rubber to make the gasket. The factory original is almost "foam like".
- Place the sheet of rubber in the freezer to temporarily harden it. This will facilitate cutting.
- If you need sheet rubber, the McMaster-Carr Supply Company will have it!