I think it's a standard top mount Fiamma. I'll have to check the model at the shop. The hatches are great. Poked around til I found some new/salvage at
http://www.minneysyachtsurplus.com/. He has some more. Size 50 sit in the frame perfectly on mine. I also have a link to 3d CAD download I can post if you're interested. I have a fairly extensive 3d model of my rig. Wish I could find a download of the cab. Hadn't thought about them protruding. I think they're lower profile than the Seitz and seem way more robust and maintainable to me. The Seitz just don't seem like an offroad product to me.