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]

As far as I can tell from looking at my split cases, the galley comes in above or below the main bolt bores and doesn't intersect.

I didn't run a borescope though them but I can't see an intersection looking into them.

That would be silly to have 30-60 psi of oil pressure sitting behind those washers.

Take a look at yours, but, there is no way for the oil to get to or past the nylock portion without first leaking around the washer and the bolt shaft. I don't remember ever seeing rubber in any of these nuts, Only brittle old nylock material (red). Somebody tell me if I'm off my rocker.

There are anti-vibration clips that go on these long bolts at the middle of the case split but again, not for sealing. They prevent the unsupported bolt span from resonating and loosening.

[worn]

As far as I can tell from looking at my split cases, the galley comes in above or below the main bolt bores and doesn't intersect.

I didn't run a borescope though them but I can't see an intersection looking into them.

That would be silly to have 30-60 psi of oil pressure sitting behind those washers.

Take a look at yours, but, there is no way for the oil to get to or past the nylock portion without first leaking around the washer and the bolt shaft. I don't remember ever seeing rubber in any of these nuts, Only brittle old nylock material (red). Somebody tell me if I'm off my rocker.

There are anti-vibration clips that go on these long bolts at the middle of the case split but again, not for sealing. They prevent the unsupported bolt span from resonating and loosening.

Thanks. Fortunately i have an extra split case to look at. Will do this week. I have the blue o rings from the gasket set as well as the washers. I can also swap out the old red sealing nuts for new nyloc. Just figure that there would be a source to replace the original, as there is in the vw world.