If you don't need no stinken special tools, you don't need a sticken sunroof.
Seriously the vise grip tool is necessary to square the roof in the hole. The 6mm pins are no longer available from MB. I use 2 long 6mm bolts that work just fine. The vise grip tool is only about $62.00. Just think of how much you are saving on labor by doing it yourself, and not to mention how much fun you are having.