On the older M.B. most common sizes are 10,12,13,17,19mm along with a few stray 22 and 27mm. I have found using a well made American tool saves a lot of frustration as you'll have less rounded fasteners. Most common sockets are 12pt but with older nuts and bolts 6pts work much better. Don't forget PB blaster and WD-40. The best Tool is this Forum!!

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2dieseljohn
1979 300sd (283,000+) Road Trips
1983 240D 4-speed (350,000+) Daily Driver
1967 E-TypeS1 in bits and pieces