I would strongly advise to stay away from Quailtytopsand interiors. I bought mr carpets from them and they were very poorly made. I had to do a lot of hacking and they were very unhelpful when I brought the problems to their attention. The guy that sells them comes under several names. Read through this link - it shows some of the problems:

http://www.benzworld.org/forums/r-c107-sl-slc-class/1382031-installing-carpets.html#post2926646

I bought my top from Diamond Mall - it worked out fine, but I have no experience with their carpets .

Generally World Upholstery is a safe bet, although they are slightly more expensive.

If I was doing carpets again, I think I would buy the carpet and make them myself. Just a few parts need edging and there are probably people locally who can do that.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5