With the tabs tacked to the risers, I marked the position on the front and back of the riser on the floor, and carefully took the seat out and marked the riser tab holes. If you wanted to spend a little more time making tabs that went up to the old bench seat mounts on the horizontal area, that would save you from filling in those holes and drilling new ones. I'm not restoring this truck (cringe from some) and don't mind stock deviations. | 
Oddly enough, many of the new seat mounting holes went through a second layer of sheetmetal substructure under the floors, so all that was left was to install new 3/8-inch grade 8 hardware. | 
For the holes that went through a single layer of sheetmetal, I made these 1/8-inch doubler plates that get welded in from the bottom side. Again, I was hoping to do this without welding on the truck, but doubling up these areas makes good sense. I would imagine that these would help even if you didn't weld them in; use your best judgment. |
With the seats back in the truck, it was time for the eyeball test and they passed. They looked natural in the cab and not like an afterthought, which is a good way to approach any fabrication or parts swapping. | 
From the side, the risers look pretty snazzy if I do say so myself. You could paint them body color, black, or chrome them if you wanna go even faster! To top it all off, I'm comfortable sitting in the truck. | |