I have a hardtop that i bought for my z3 a couple of years back. I want to install it and i have been trying to find out what parts i need. I don't want to do the defroster or any sort of wiring, i just want to get it in and go. So my question is what parts do i need if i want to install it without the defroster? Do i need any seals of some sort so it doesn't leek or should it be good if i just clamp it down?