Top Sash Channel Guide
A quick learner from California says:
July 15, 2014
This is off a 24 year old non-tilting window sash. It is made of aluminum and measures 1-5/8" from top to bottom. It measures 1/2" from the outside of the longest side to the end of the cross piece. (The lower cross of the letter "F" as seen from the side.) Manufacturer is unknown.
Tom from SWISCO responded:
July 17, 2014