Fit the provided seatbelts between the bracket and the seats and then bolt on the seats, back-end first. You can also mount the seats onto the brackets outside the vehicle and then bolt them in as one unit. Beard engineer Al Hinkle advised that all the bolts remain loose so that once the seat is installed it can be aligned correctly. Once alignment is satisfactory, the bolts can be tightened. The holes in the brackets are slightly larger than the supplied bolts for this reason.