Last of the 6 volt to 12 volt conversion issues for Porsche 356 6 volt autos, left side is the original SWF 6 volt VW wiper motor. right side is the SWF 12 volt wiper motor out of a 1967 VW bug. Early Porsche used VW parts. So finding the wiper motors are easy. Obviously the rotating shafts are different. without having to machine a new shaft, the SWF folks made it easy, just remove the 4 bolts and swap out the lower gear assemblies. they are identical, pack w new grease, bolt up and go. You will not have to use a step up/down transformer/coil to go from 6 volt to 12 volt.
www.sierramadrecollection.com has the 10 inch wiper blades. maybe a VW site does too.