I confirmed tha tthe bolts with the kit are 1/4-20 thread so I made some screw plates.
I could not see how to get the striker plate to work with the flange as received so I cut it back (not completely off) only to discover that the vertical hole spacing is not the same as the cab. The striker plate holes are 4 3/16" center to center but the cab measures 4".
I have contacted the manufactuer after getting their information from the vendor that supplied the kit.
I may just need to make my own striker plates to get this put together.