Maybe the belt in the Kleemann pulley kit is leather. If you're talking about performance add ons there's a new player coming out every month. Last I heard there's Kleemann, Upsolute, Dynosport, Carlsson, Renntech and ASP Racing, Evosport and some others will have kits soon that either involved ECU mods or pullies. Prices range from about $100 for what ASP might charge (based on other pullies they sell) to about $1,500 for the RennTech. Mark Cummings on the other board is working on a group buy with Evosport and/or Kleemann. Stay posted for more info as it happens. As for leather classicsofttrim is your best bet from what I heard.
BenzWorld.org forum is one of the largest Mercedes-Benz owner websites offering the most comprehensive collection of Mercedes-Benz information anywhere in the world. The site includes MB Forums, News, Galleries, Publications, Classifieds, Events and much more!