We had previously ordered your part 18-192 but this was not the correct part.
Length 1.5" Top piece is 13/16" long By 1/2" wide
Tom from SWISCO responded:
July 18, 2019
Hello,
Since this top sash guide isn't made anymore, we can't guarantee a replacement. That being said, the best option we have is our 18-166. Take a look and see what you think. Thank you!