Have you ever seen dove tail scope mounts such as this ? They measure 7/16" across the top.I have no idea and have never seen mounts of this type. Thanks to anyone who can help.
7/16" is very close to 11mm. You could try 11mm ringmounts, such as are made for CZ rimfires (among others). Assuming the "claws" fit, with that stop at the front of the front mount they should stay in place quite nicely. FWIW I use such mounts (steel ones, with little levers to allow them to clamp and release by hand) on a 9.3x74R without a problem.
