this roller is about 1-3/16" long. It does not have two height settings. The wheels are about 7/16" diameter and about 1/8" wide.
Paul from SWISCO responded:
May 23, 2017
We don't have this exact roller, but we do carry the the new style assembly for Milgard sliders. Take a look at our 87-201 and see if you could use this as a replacement.