Thanks for the help.
- the rib is 12.5mm
- I'll send an email to Steve Earle on the subject.
- I have some new Burris rings, and they sort of fit, but need modifications (which I could do)
- I am bidding on a Weaver V22A scope with tip-off rings to see if those would work
- Steve, I'd rather not modify this rifle

In general I am struggling to find drawings for standard dovetails. Any pointers?

Thanks again,
WC-