Think you should be able to swap studs. Not sure the whole hub and rotor combo swaps.
As for model designation,. D is 2wd,. W is 4wd. 100 is light half ton, 150 is heavy half, these came about in the mid 70's due to emission regs. 200 is 3/4 and 300 is 1ton.
The 9500 tossed out above is referring to gvw.
I remember reading that the 150 designation was what allowed the '78 Little Red to have a higher GVWR and therefore escape the catalytic converter requirement.
I wonder if all 150s in '78 escaped the converter requirement?
Good luck on the stud search!
