Get a Milt Sparks Summer Special for a Commander, or a Mitch Rosen ARG, and be happy. That is what I use. They may well even make up one just for the shorter EMP, but I have Commander length IWB holsters, and they work well. The EMP is a gem. I do use a Rosen cross-draw model when driving my Vette, due to the tight confines of the car while using the seatbelt. Sorry, can't remember the name, but it works well.
If only they made the EMP in .45

Amanda