Hey, Glass Guy, it's me again
I looked real careful through the Strybuc catalog. "Slider Guides" under "Window Replacement Hardware" came real close, but none of those items are quite right. Those are mostly complex bits of plastic. The thingies I need are simple, by comparison. Just a three dimensional rectangle with a notch cut out. The sheet metal screw goes thru the fat part. The skinny part goes under the edge of the window frame.
Unless I missed something, there's nothing like that in the S.R. Laurence catalog.
I'll post some photos, soon. It's nice to know that someone is interested and trying to help. Thanks so much.
Peggy