With my long legs and aging body it is getting harder to enter and leave my 560SL. Does anyone know if a smaller diameter steering wheel is available that will fit the column shaft?

u can buy a hub adapter and fit any size steering wheel with the universal 6 bolt pattern on them. finding one that would match your interior (if u are picky) can be hard tho.

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198? 300D ???K - Future DD
1989 300TE 285K - traded in '12
1984 300SD 186K - Sold in 08
1978 300SD 330K - Died in 05

Steering wheel replacement is usually dependant on the airbag vs. non-airbag, then if there is an airbag, what generation it is, to determine what steering wheels can be put on. Non-airbag cars obviously have the widest choice. With airbag equiped cars, you're pretty much looking at the other MB, AMG or other tuner's that have the airbag system.