There aren't any shims, at least there weren't in mine or in the kit I received from Mercedes. There is a wavy washer and a large washer though. Put the cartridge in the hole, drop the wavy washer over the spindle, then the large washer on top of that. Chances are good that the new cartridge will come with them already fitted (mine did).

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)