Don't know where ya got that idea Big, I've been talking about the front bar all along, did I make a typo somewhere back there??
Lonnie, they might look the same but if you look on page 144 of the "Truck Data Book" the chart lists the width at the front at 29 1/4" for the 3100, 25 1/2" for the 3600, 25" for all of the larger trucks.
Rears are 47" for the 3100 and 36" for all the rest.
DG