Those pumps look like really intriguing possibilities. Do you know if they put out similar pressures to the MB pump and how exactly they work? Does the pump only activate when a switch calls for increased pressure or does the pump run the whole time the car is running? I don't think the pump would need to run full time for a 123 sls system. A switch in the passenger compartment to turn it on when a load was added to the back would be adequate I think.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13