Here people get them made locally.
The original have a slight bend, but it is too expensive, so a friend in a large glass distribuitor found they had the overlays, and they made one for me , I paid some $50 or so.
Main fault is straight, not bend, so the gasket is not so tight in the lower end, so what?
It works ok, uses the regular hydraulic raisers,... the nissan reps asked more than $200, when I asked.
Take care