A note on the GM opening split style windows: If anyone is/has removed this style set-up it would be great if you could hold on to them. Please do not throw away this stuff without offering it for sale first. You might be surprised at how many guys are wanting these for restoration projects. We don't care if they leak, or the glass is broken. We'll have new rubber made, and glass if we have to. A friend in CA. had to shorten a pair from a 4104 for his Scenicruiser (glass & frames both cut down). The 06 & 04 stuff is still (for now) somewhat out there, but the Scenic ones are not to be found anywhere. I looked for 12 years and only saw two 4501 sets. First set was in a very rough non-running old conversion that was for sale for $6500, and seller would not part with just the windows. I offered enough that he could have paid for new motions version installed! No dice. The second pair I ended up with, thanks to Kyle. He and I bought a pair of Scenics together a few years back, and I got my windows as part of the deal. The same goes for any/all brands, please save what you can.