I sent you a PM, but see that you haven't read it. So I'll post it here also...
Are you looking for a set or just one to be able to use your rifle?
You might check the Remington forum over on rimfirecentral.com
I had a 41P about 15 years ago. Had the same issue back then. I have an insert in my toolbox, but I'm not sure what rifle it is for.
What is the max. dia. of the insert, and where are the tabs located (9:00 & 3:00, or ?)?