Ok, you got me concerned so I went to my stash and retrieved the aforementioned Leupold rimfire rings. I had a Kimber 82, unscoped, late A action, 53K+ serial #, grooved receiver, and installed them. Perfect radius match.
So for reference, they are Leupold Rimfire 11mm 1" medium gloss, part # 54231. There is an orange label on the front that says "Ringmounts CZ/Rimfire/Cross-Slot" but other than the finish and the smaller tightening screw head, they are dimensionally the same ring I've used on Kimber 82 rifles for years.
