Does anybody have one they would be willing to part with?

Unless you really want one, easier to grind off your firing pin and use a short one.
To answer your question; I have none for sale.

Will this work with the Lyman bolt peep sight?

I have a couple I could part with.
Don

If you have the sight with the little dovetail adaptor, it will fit any length cocking piece. If you don't have the adaptor, then you need to cut a dovetail in one. I use the long ones for that. Those sights are quite rare, as you know.
We would like to see a pic of your sight; most guys have never seen one.

I'll get pics tonite and post them. Don Markey, check your pm's.

Which cocking piece does your rifle have on it now?

Oberndorf action, short cocking piece.

Ok, they made a little adaptor which was held onto the cocking piece by set screws, which I assume you don't have. So, you will have to get a long cocking piece (you know this) and cut a dovetail in it for your sight. Anneal the back first; if you are careful you won't soften the sear or cocking cam. You are very lucky to find this sight; they are rare.

This is how I mount them. I wish I had some pics after getting rid of all the sharp corners and blending it into the contour of the cocking piece.
Don