I have a SW1911PC Commander sized which is my daily carry gun (at least in winter). I like a tritium night sight, preferably green, for the front as I find I focus better on it. My issue is in trying to order the correct part as the 1911s are all different. Can someone please help worth the correct sights to order. I will order both front and rear if necessary, but would prefer front only (I like no dots on the rear sight).