@Bob: IM S6 posted:Haartz is a good material, but if you want to go top notch, German Happich cloth makes a fantastic top.
If you order a ready-to-be-installed top from IM, see if they will make the edge trimming (around the side windows) from leather, instead of vinyl. Leather will last that much longer than vinyl trim.
You may also have to specify what back window you want, but a zip-out one - one that can be zipped down for top up, breezy driving - is a good idea. It's great for intolerably hot days.
Good luck.
Bob here is absolutely on the Money. Autos International can make you an IM top I believe they are the suppliers but you need to know the model so IM would be the one to get the information from because they changed their design to prevent side window edges from damaging the top especially on a ROadster. A Zip out rear window is a must IMHO, don't buy a top without it. I also believe that Frank at Auto's International could do the install or can direct you to someone.
Bob, I never saw leather on the edge but it's a good idea.
To prevent the edge of my top from wearing I installed a window module that allows my keyfob, from IM, to not only lock and unlock but it can now drop the windows so that you open the doors with the windows Down. When you lock the car as you leave the car, the windows go up.