v700 sleeve-nut Unobtainium?

[Dadseldo]

I've got a '73 Eldorado I'm working on that the previous owner never got to putting back together. Heads need to be torqued down but one of the top sleeve-nuts has got totally jacked up threads and when I took it off the whole stud came with it. After doing some research I've learned that the heads are from a v700 and don't have the normal 10 mil Allen sleeve nuts. Instead it's got 17 mil nuts that are much longer and have an o-ring on them to double as a plug for the rocker box. I can't find a replacement anywhere.
Anyone know where I can find one? Or should I just make something else work? I've got a '72 Eldorado parts bike that I could rob the nuts from, but then I need to find another way to plug up the rocker box.

[SIR REAL ED]

If you post a picture, that would be helpful.

I would start my search with industrial fastener supply companies.

[Antietam Classic Cycle]

You should really use the correct heads from the parts bike. V700 heads have smaller valves, the intake port is too large and requires the factory reducer, and then there's those weird bolts/nuts with o-rings on them that leak.

[Dadseldo]

You should really use the correct heads from the parts bike. V700 heads have smaller valves, the intake port is too large and requires the factory reducer, and then there's those weird bolts/nuts with o-rings on them that leak.

Yes I think you’re right. The parts bike has a good number of miles on it. Is there anything I should check or do before swapping the heads over?

[Antietam Classic Cycle]

Yes I think you’re right. The parts bike has a good number of miles on it. Is there anything I should check or do before swapping the heads over?

I would definitely check the fit of the valves in the guides, condition of the valve faces and seats.