I have one stock Whitetail and converted a 4" dovetail Ascent to a Whitetail with a new base and shorter axle on the dial wheel (had to send it in for the shorter dial axle). Nice sights...all I need for mountain hunting in the west and north. Compact, light and adequately durable for my use.
As far as # of pins, most are set up with 1, 3 or 5, but you can get easily add or remove them. There is a difference in whether a pin is fits the front or rear track of the sight....order through S&S Archery in Boise, ID and they will get you what you want for pin color, size, # of pins, etc.