Replacing bottom weather stripping for vinyl sash

Question

I have some tilt in vinyl windows I need replacement weather stripping for the sash bottoms. Appears to be some type of bubble stripping. I've attached a diagram with the dimensions and some pictures.
An important aspect of the existing stripping is that it has an actual 1/8" wide "strip" fitting into the compressible bubble to help give it structure (this is the thin line at bottom of diagram). The white bubble portion is open at the bottom so that it can fit around this strip.
As for installation, you can see my windows don't have open slots in one of the pictures. Do you kind of just tilt the strip in and smoosh it? It was kind of a pain to get the one in the picture back in :)
Thanks!

Casey · Accepted Answer

Hello,

Our closest option to your seal would be the 58-156 shown below. With that being said, the backing width of ours measures 3/16". I'd suggest double-checking to see if this might work for your application. Note that the seal is intended to slide into the opening in the end of the sash frame. Thanks for posting.

Profile view of 58-156