[Xellex]

Well this is what I did:
As you noticed, the rubber holes in the MC are too big diameter, for the beetle stock nipples to fit in.

I couldnt source the nipples that could fit in time, and this was easier and more fun to do, so I cut the nipples off the original 944 reservoir:


You can see the difference in diameter better here:

And then I put the beetle one through the porsche one, and glued them together with transparent "poxipol".

And this is the finished product: