The photo attached is the bracket fixed in the bottom of the window and attaches to the sliding shoe in the window frame. It is 2-1/2" long X 5/16" X 3/16"
Tom from SWISCO responded:
May 9, 2018
It's hard to tell what your hole placement dimensions are, but start by looking at our 26-241, 26-272, or 26-378. One of these may be a good option for you.