[rotorwrench]

The backlight term has been in use in the US since the horse & buggy days. The terms use is not as common today but many upholsterers still use it when referring to the rear window. All cars had open tops in the beginning.

The split glass window was an option in 67 if I remember correctly but the car may need the deeper well from the later 1967 cars for it all to fit in there. A person generally has to unzip the backlight curtain before folding the top if it has the heavier glass set up. The silicon seal between the two halves has to be renewed now and then with the two piece glass. Folding it wears the silicon seal out.

If the rear curtain can be removed from the top then it could be repaired or replaced to give an old top a little more life. I've never tried it so I can't tell you if it can be done or not. If it can't then the whole top would have to be replaced.