I scrapped the idea of using my 952 in competition due to the lack of made-for holsters. But, if I remember, Blade-Tech said they have one if you're not concerned about holster wear on that nice slide. The brand Safariland (#568 I think) comes to mind as well.
If the 952 is about the same size as a model 52 I use a Rogers brand that says on the side "Plaxco World Speed Model Longslide by Rogers" I have had this holster since the mid 80's and it holds my 52 just fine. It may have to be tightened up with the adjusting screw. Jeff