I have a 1989 Ford Mustang convertible. Can you put convertible frame with top from 1992 Mustang?

No, you can't directly swap a 1992 Mustang convertible top frame and top onto a 1989 Mustang convertible. While they might look superficially similar, the body dimensions and mounting points are different enough to make it incompatible. The frame itself won't fit, and even if you could force it, the top material wouldn't align correctly with the body. You'd be looking at significant fabrication and modification, likely more work than it's worth. It's best to stick with parts specifically designed for your 1989 model.