Ribbed Bubble Window Seal

I'm going to attempt to refurbish a couple of windows. I've been able to locate the proper cranks, but cannot find an easy match on the window seal. The attached photo shows a cross-section of the existing seal. Seems like most of my windows have this seal squished down flat and it's beginning to come out of the track and just flaps in the wind whether the window is open or closed. If I manually open up the squished tubular portion, the complete cross section of the seal is about a half-inch.