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All you need is a heat gun to turn this type of holster into a LH from a RH. Assuming it's the same as most "pancake" style Kydex holsters. That's assuming the front and back match up as they appear to do in this pic.
Revolvers. GP100 or 686 in 4.2 or 6" lengths. Seems like hardly anybody carries revolver holsters, other than Uncle Mikes nylon ones or various leather Cowboy Action stuff.