Does anyone have any guidance on how to identify Z3 hardtops from different manufacturers? There are three that I know of: BMW OEM, Wiesmann, and Hamann. I've run across one that looks exactly like an OEM, but it is missing the rain gutters. I've heard that some owners used to fill them in and repaint, but I've also heard that it could be a Wiessman. I can't find much on the interwebs about how to tell them all apart (though the Hamann with the top rolls is pretty easy!). Michael
