im sure youve seen this thread that suggests that the m112 has the same bellhousing as the chrysler crossfire and SLK320??
see here for the thread-
http://www.benzworld.org/forums/w202-c36-amg-c43-amg/1557093-c43-manual-transmission-conversion.html
see here for the box-
http://cgi.ebay.com/ebaymotors/04-05-06-07-CROSSFIRE-MANUAL-TRANSMISSION-Excellent-_W0QQcmdZViewItemQQfitsZMakeQ3aChryslerQ7cModelQ3aCrossfireQQhashZitem3a679a7375QQitemZ250846278517QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories#ht_500wt_1182