I can't specifically answer your question at the moment, but I just changed mine on the '90 300E 2.6 the other night. The wrench was in the standard set.
Get a good quality set. Mine are Bondhus balldrivers (see picture). The rotor bolts are tight! You probably only get one chance to get them loose without stripping them. These are about $12.
Experience is something you don't get until just after you need it.