Try a holster for a springfield XD. mine is holstered in a blackhawk level 2 xd holster that I tested with my commander's xd and it fits. He uses a level 3 safariland holster. The only problem you might have is the thumb break not fitting right but i doubt it. Try that it should work.
So I just got in the uncle mikes pro 3 holster that fits the glock 17,19 & 22 and I fits like a charm after reading up on the specs of both gun they are very similar in size so like I said it works very nicely