Unfortunately, I believe that the tops have been discontinued. In doing a google search I found this place that you might want to look into. Looks like they're based out of Rhode Island. Let us know what you find. Tops are going to be a main pain point, among other parts, that are going to be difficult to procure as time progresses. Convertible Top Guys
Check with forum member Hoosier GXP. He lives in Portland, IN. Last I heard, he does not ship reclaimed convertible top assemblies. You would have to drive there and buy one in-person. I know because that is what I did a couple years ago.