I have for sale on ebay a tandem p/s pump for a W140 chassis for use with self-leveling suspension. This is a VERY expensive pump with a MB list of $831 and even rebuilds go for $500-600. The part number is 140 460 06 80. There was another pump used on (I think only) early models with a part number of 140 460 07 80 and they are NOT interchangable (this is why I have this one!) so be careful in what you need. Here is the link:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33588&item=2462418858

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1996 SL320 97K miles
1996 C220 130k miles
1992 500SEL 170k miles <---sold
1986 300E 216k miles <---sold