Snap in window glazing

A home owner from Danville, ILLinois says:
I have wood-framed double hung windows (brand unknown) that are about 40 yr old. The snap-in glazing is getting brittle on some of them and I was looking at your Capitol Snap-in Glazing 55-030-6. I then noticed your identifying service and I am. Thinking about purchasing just a couple of pieces to verify if they work. Any recommendations. The pics are from a broken piece with paint and age on it. Thanks
A user submited photo of window glazing
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Paul from SWISCO responded:
Thanks for posting! The 55-030 snaps in on top of glass where yours snap inside the wood frame. Being a wood sash, I think 55-156 would be a better fit. What do you think?
A home owner from Danville, IL says:
Thanks....the 55-156 appears to be larger both directions. Maybe the best thing is to test a piece of both and see which one I can modify to work the best. It takes about 15' to do one opening, so I can afford to do some testing. Thanks for the reply.

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