A couple things - an 11mm dovetail is /was typically a European standard size - can look up on inter web - measures 11 mm wide at widest across the top - was cut with 60 degree slope dovetail cutters. North American standard usually called a 3/8" dovetail - but that is measured at extreme bottom - tips of cutter are .375" apart, and cut with 45 degree cutter, so top width a bit over 1/2". Some rifles, like CZ 452, came with either an 11 mm or a 3/8" dovetail - almost like depended on year or month or destination - most definitely are both sizes used on CZ 452 rimfire rifles. Rings are available for both 11 mm and for 3/8" dovetails - some, like Warne, can be used on either width by reversing the clamp. Some rings need / want a "flat topped" dovetail - others can tolerate a "curved" or "humped" top.
If you want to get really funky, some receivers, like the Cooey 600, have dovetails cut directly into the receiver itself - so the ring mounts attach directly to the receiver - no base in between. Ring mounts are available in various heights.
If you start to play with adding height to the comb, do not overlook that the bolt needs to open and come back - often want to actually be able to remove the bolt from rifle without removing action from stock, so, in some cases, that adds a parameter to what height that you can or want to add to the comb.
