For the feeler gauge try www.samstagsales.com. They carry all sorts of usefull tools for Mercedes. If you need one sooner you should be able to find one at good sized auto store. Just be sure to get the metric version.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold