Moonstruck is on Turner Classic Movies, and it’s letterboxed. 
Damn my lack of ownership of blank videotape. Moonstruck is only available letterboxed on Laserdisc, which not only can’t be found, but who owns a Laserdisc player? On VHS and DVD, it’s cropped badly, no doubt to Norman Jewison’s horror. Eventually, I’ll settle and get the DVD as-is. I’ve been holding out for a letterboxed DVD for years, and I see now that it’s just not going to happen.