Wow,I must have missed this thread.The ragtop for my wagon is 43x90.That brings the bolts up to the roof support without cutting into them.As for install I havn't put mine in yet but it's pretty straight foward Just don't cut the supports around the roof.Top is so big it cost a small fortune at $1100 but it's worth it to get the biggest you can.Streetbeat is where I got mine also webasto can custom make one if you don't mind waiting three months.
www.webasto.com
www.streetbeatcustoms.com