Yeah, I don’t think I’ve seen a native 5:4 CRT. I imagine it’s a lot harder to make a different aspect ratio with CRTs, since LCDs are essentially cut out of a sheet, while CRTs are molded glass.

With LCDs, though, 1280x1024 was a fairly common native resolution. If you were getting an LCD above 1024x768 that wasn’t a widescreen, it was almost certainly 1280x1024.