Quality rings to fit an 11mm dovetail mount are available from:
Burris, 1" only, 1 height
Kelly makes rings to fit 1", 30mm, and 34mm. The 30 and 34mm rings are available in flat and with 25MOA of elevation.
Leupold, 1" only, 1 height
Talley, 1" only, 3 heights
Brownells, 1" only, 4 heights...