Sealing nuts, Chasing oil leaks all the way Options

[worn]

So, the 911 motor died in montana, the six conversion was considering jettisoning the tranny, and on the lift is the four cylinder 914. For a brief time i figured the fracking had paid off, but now I have to admit major problems with oil leaks.
Most of the trouble is probably from the oil pump gaskets, Melling. Along with oil filter console leaks.
I also want to replace the case bolt sealing nuts with new ones. I cannot find them though. All that i can find are 12 mm nuts for type 1-3 engines. Have they really stopped making the sealing nuts? They look like nyloc nuts with rubber in place of nylon.
Thanks folks.
Warren

[Superhawk996]

Note, the leakage isn't likely to come past the Nylock insert.

Where they do leak is from between the washer and the case, between the washer topside and the nut. I put down a little Permatex between the case and the washer and a dab of YamaBond between the washer topside and the nut on final assembly.

This area isn't under pressure if the PCV system is working properly. More of a weep risk than an outright leak.

[worn]

Note, the leakage isn't likely to come past the Nylock insert.

Where they do leak is from between the washer and the case, between the washer topside and the nut. I put down a little Permatex between the case and the washer and a dab of YamaBond between the washer topside and the nut on final assembly.

This area isn't under pressure if the PCV system is working properly. More of a weep risk than an outright leak.

I thought that the bolts were made to run through oil galleries in the case, and therefore subject to around 3 bar of pressure. I agree that this isnt a big worry area, but am surprised i cannot find the nuts. Perhaps the nyloc nuts will do the same thing as the rubber sealing nuts.
Thanks