The width of the seats including the jump seat is 57 inches, same as the bench seat that came with the truck. The rails on the new seas are wider and they also had hooks and nipples i cut off with a cutting wheel and then used an angle grinder to smooth everything out.
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My goal was to use all the existing holes if I could. I welded two 3/16 in thick steel bars on the seats and sat them back in the truck and marked where the holes would be by shooting up the holes with spray paint. Since the passenger side only had two holes because there was a bench seat, after I marked the two holes and drilled them i measured out 10 inches for the other two holes I had to drill because there was clearance underneath at that point. I utilized m10 1.5 60mm bolts.
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As for the jump seat. I used one of the existing holes that held he bench seat closest to the driver and welded a 6" piece of steel to the bottom of the jump seat and bolted it down from the rear. I then used two #14 2 inch slef tapping sheet metal screws on each side to hold it in place.
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