One other thing you might want to do, buy yourself a Haynes manual for the W123 chassis. These cost about $15 at any autoparts store. This will help you alot. These books have excellent photos in them.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member