VW diesels had two types of crankshafts, as far as I know.

One is the "regular" type proper for the vanagon where a main journal
steps down to a seal journal, which in turn steps down to a smaller
segment on which the front drive pulley bolts. It has a woodruff key.

I have recently gotten what is called the "big-nose" version crank--it
doesn't have the final step for the pulley or a woodruff keyslot.
Instead, the drive pulley mounts over the end of the seal journal, and
there is a squarish keyway cut into the front of it.

Does anyone know if I can use this big-nosed crank in place of my
original if I replace the front pulley with the matching type, and if
so does anyone out there have the matching type?

Thanks,

Jim