I bought a set of the ones
@Derelict makes and sells through Northeast Classic Ford Parts, a couple of months ago. Mine are clear anodized.
I spoke with Tom, the guy who makes them. He told me the first 50 or so pairs were difficult to install but he'd made a change to fix that. Mine were as easy to install as the stock solid glass windows. I re-used my old Dennis Carpenter (US made) gaskets because they were still in excellent condition.
The windows are very nicely made, and they solved a problem for me that has bugged me for years and that I posted about a few months back. Stagnant air in the back. No place for it to go. With the rear windows barely cracked I get much better circulation. I have a Vintage Air AC system, and even though it's recirculate only, having the rear windows slid open maybe 1/2" makes all the difference. Cool air gets into the back and I don't feel like I'm sitting in front of an oven.
I overlapped the string at the bottom, used plenty of Polywater J electrical cable lube and did them both by myself. Easy.
