Comparing 68-70 Dodge & Plymouth B-body 2 door wheelbase difference. I have been doing a little research & my source states that:

Dodge 2 door is 117"
Plymouth 2 door is 116"

I seem to remember hearing that the front spring mounts in back were shorter on the Plymouths.

My question: Is the difference in the spring mounts the reason for the differing wheelbase lengths ? Was there any difference in floorpans, rocker panels, etc ? Are the 4 door versions the same wheelbase as the 2 doors ?

Hypothetical scenerio: I got a 68 Charger that the underside (rails, floor, torsion bar crossmember) is shot. Prefer using a solid parts donor car instead of aftermarket. Would I have to look for a donor that is strictly 2 door Dodge or would a Plymouth or 4 door ( of either make) work as well ?