These T-shaped shoes/locks are gray with a white "puck" and a silver metal center. The slot in the metal piece goes all the way through.
They measure 1-1/4" wide at the bottom, and 1/2" wide on the stem. Not sure how tall as the hook on the end has broken off.
Two numbers appear - PAT 4610108 at the bottom, and 8679000.
There is no window manufacturer ID'd on the vinyl double hung tilt windows. The channel balances are plain, block and tackle types (most like your Series 795) with 26-5 stamped on them.
I think your
15-195 product is what I'm looking for. Do you agree?