Top cap for sash

A quick learner from Overland Park KS says:
I need new caps. I ordered new balances (2430) and have also found 24B on a balancer. I can find no identifying info on 50 year old aluminum windows. Can you identify these? Thanks!
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Jasmine from SWISCO responded:

Thanks for posting. I recommend starting with our 18-199. Compare the dimensions to your existing top sash guide to confirm that this is the correct fit.

Dimensions for 18-199
Dimensions for 18-199

Dimensions for 18-199
Dimensions for 18-199

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