Re: spare tire??
Do a search on e-bay for M-B SLK donut spare tire. I found one last fall from a salvage yard in Calif. It was off an 02 SLK & never used yet. Paid about $110.00 plus frt. Put air into it to make sure it expanded & was a good height fit to my X-fire dia. tires, sent away (again to an e-bay ad) for a tire cover. This lil donut spare fits very neatly in our trunk. I have it standing up since my spare box of trunk items I carry keeps it propped in place. It is so small that it doesn't even show above the top of the divider to the trunk. You could also lay it down on the floor if you want with much room for storage left. The way I carry mine I still have room for two small overnight suit cases. Good luck