Don't know the dimension you need but the frame width should be 28" at the centerline of the front axle. I would venture to say if you measure the center to center of the king pins, then took one half of that minus 14" (1/2 half the frame width you would have the answer. Just a suggestion. Neither my assembly manual or shop manual give the axle measurement.

Good luck.


cgresham1212
If you don't drive it, why have it?
55 1st Series 3100 5 window