Thanks for your input and information about the sunroof installation. I have another cartridge that is already apart ,can use that one to cut the opening and roll the edges,and not have to disassemble the one I just bought. I am wondering if I should install it with stainless steel countersunk screws so it can be removed and serviced if necessary like the 73 and later sunroof cars are. Thanks for posting the pictures of your car and amazing work.