Width just over 5/8 inch
Top to hole center 3/8
Top to bottom 3/4
Top shelf thickness 1/8
Top shelf extension 4/8
Tom from SWISCO responded:
March 23, 2018
Based on your photos, we believe you have a Pan Am window that uses 18-042 Top Sash Guide Pair. If you want to be 100% sure that this is correct, please look over dimensions.
A quick learner from Florida says:
March 26, 2018
Thanks for the reply. I got the part today and it fit ok.