MI Window, Needed Part holds ballast so sash can be removed

A quick learner from Marietta, GA, 30062-3254 says:
September 26, 2013
Window is a discontinued MI Window, 1994/1995, series 150/250/350 (I think). No part numbers remain.

Metal parts needed, eight (8), to replace bendable/breakable plastic parts. This 1" size part screws into top side of sash. It holds the spring-ballast in place. The picture showing ruler has plastic on left, metal on right. All my plastic have bent/broken and no long properly hold spring-ballast in place. My metal ones work fine. I need 8 metal parts.

User submitted photos of window hardware.
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Paul from SWISCO responded:
September 27, 2013
Ah, I think I recognize your top sash guides. If I'm right, your version has been discontinued by the manufacturer. Check out our 18-093 for the new replacement and see if this is a good match.
5/8" Top Sash Guide, Capitol
5/8" Top Sash Guide, Capitol
18-093
$1.55
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