Cylinder head studs and nuts

I just pulled the cylinder head and sleeve from my 1984 CR500. Three of the nuts pulled the studs out of the case and the fourth one came off leaving the stud in the engine case. I've got one nut off of one of the studs but I'm having issues with the other two. I'm assuming it's preferable to have the studs fully installed in the case and then tighten the nuts rather than have the nuts stuck on the studs and use them as long bolts.

Anyway my question is, Does anyone know of a source for studs and nuts? just in case I break these ones.
I've used heat and penetrant but it appears the nuts are fully threaded on the studs.

Thanks in advance for your responses
Adam

If their the same as the 83 engines I have a set if you need them. I just smack them lightly a few times with a hammer then use some penetrating oil and they usually come off.

I guess I posted a little prematurely. I spent another hour in the garage and I was able to get them all apart and chase all of the threads. The nuts were so far threaded on to the stud that they were trying to make new threads.
I took this apart to replace the cylinder base gasket because I could see smoke coming from that area while it was running. I have a feeling that it wasn't torqued right by the last guy due to the stud/nut not being installed correctly.

Thanks tommie for the offer, fortunately I won't need them.

While we are on the subject. I was sold the incorrect clutch cover gasket from Malcolm Smith Motorsports. It isn't worth the gas money to try and return it, so if anyone needs a new gasket let me know. The part number is 161079201 and it should fit a 125.
I might start a new thread for the gasket if I get no response.

Thanks again
Adam

Now just to specify. The studs have a long threaded end and a short threaded end. The studs were installed with the long end going into the case.
Is this correct???


Thanks
Adam

Adam,
I want to say the short end goes into the engine case but will have to go check out a engine to be 100% sure.