Presumably you want the self-timer shutter from the DS, not the diaphragm in the viewing lens? Otherwise the 105mm D will give the same back focus. The earlier 105's have a different optical design.
Actually I'm mostly after the viewing "DS" lens with the diaphragm! But any of the Heliar lenses would do.
It is my understanding that there are two "D" versions, one Tessar and one Heliar like the DS. Virtually indistinguishable apart for the barrel length (34.95mm for Tessar, 36.25mm for the other).