Serpa Shoulder Harness?

[nrakid88]

Have you guys used one? I love the serpa. I want to use it as a shoulder harness. I would order one but I am confused about two things, what size to get, they have no sizing information. 6'2" 180lbs. Medium or Large? Also I shoot with the right hand, so I need a cross draw so the gun is under my left arm... do I get the right hand or left hand version? I think right hand but I dont want to assume and be wrong with a harness that wont work