You could ask this guy. His work is excellent and he may be able to help as he seems, based on my experience, willing to help customers with specific requirements - at least he was willing to make a case for me using a custom color (which is not quite the same of course). His standard issue cases are lug attached, however, he certainly makes cases that otherwise fit Leica film Ms. And for a very reasonable price. The alternative is to buy a Leica M ever ready case (they can be found now and then) and throw away the top part. I did this for a number of years back in my days of shooting an M3 as it was pre eBay and so new replacements were hard to come by. Just be aware though if you are not already, that some cases have a non standard screw - larger than that used, later. A "small-screw" case bottom will mount on an M base plate which has a larger hole using an adapter insert (also available) but of course the reverse does not work.