Gapco Window installed in 1982.

Part is white plastic that attaches to thin inside storm windows and it guides window up and down and keep it from falling out and it's 3/4" of an inch in length and 3/16" of an inch in height and 5/8" of and inch in wideth with a hole in center. Hope you can help me with this issue. I have two 2 of these parts broken off and window is loose on 1 one side that tip has broken off. I need at least 2 but would like 16 to 20 of them if possible. Thanks for your help.

Paul, I think 5/16 would be correct instead of 5/8. Lol. I order them and we'll see if they work when they get here. Thanks so very much for your assistance on this matter

Paul, the part worked and installed already. Thank- you. You guys are great!