The problem is… how do you intend to mount it?
I bought a top a few months ago, and I was originally going to mount it to the top flat between the armrest, and the controls. (96 Sportster) After some reconsideration… I wanted to mount it on the outside of the hull, down by the bumper rail. (like the OEM top) The top I bought was a 73” to 80” wide unit, and it is JUST wide enough to work since the tube frame is soft enough to flex over a wide width range. If I was to buy a second top… I would have probably bought one that was closer to 82” wide for a better fit. But like I said… it’s where you want to mount it.
BTW… Mine is 6 ‘ long, and 48” tall. Those dimensions seem to be close to the older OEM top, and I got it from a company on eBay for $120 shipped.