This is a plug and play solution for your 144" wheelbase Mercedes Sprinter van. This floor has the original cutouts and the original floor brackets for an OEM Sprinter 3 person bench seat. The floor will fit any 144" wheelbase Sprinter 2007-Present. The bench seat floor brackets are for bench seats 2019 and newer style.
Another benefit of this floor, is that if your van did not come with seats originally, the cut-outs in the floor act as a template to show you exactly where to install the hardware for the brackets. Plus, many Sprinter vans have the nuts already in the floor ready to go, under the sheet metal floor. This would more easily allow you to find them and install the seat brackets, if the nuts are present.