My early '60s Mercedes have STUDS pressed into the axle hubs and flanges, with LUGNUTS screwed on to hold the wheels. Don't know when Mercedes switched to LUGBOLTS but suspect it was around the late '60s.
Doesn't your SD have LUGBOLTS that screw into threaded holes in the axle/hub flange? If the '65 220SE has STUDS that are too short to hold your alloy wheels, you would need to drive the studs out of the axles and hubs, then install longer ones. No way to screw your SD wheel LUGBOLTS into Fintail wheel STUDS.
Last time I checked, NTB stocked cheapo house-brand 185/80R13 tires that would fit those Fintail rims, if you must use a tow-dolly.

Happy Motoring, Mark

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DrDKW