I bought a used seat and now need to drill the floor for seat mounting. The passenger Sprinters come with mounting bolts attached to the frame (seems even one in the frame rail) and floor. I got the factory seat mounts with the seats but I’ll need to drill the floor and add bolts to the factory mounting hardware. Yesterday when I got my used vents I also picked up the rubber floor mat from a wrecked Sprinter. I can use the rubber mat as a template to cut my floor as it already has the seat cutouts. Using the floor mat will make the job of cutting the floor easier and more accurate.