There should be retaining bolts at the feet of the seat keeping it down to the floor of the vehicle. Remove the nuts and you should be able to lift it ot.
AT FIRST REMOVE BENCH SEAT THEN INSTALL ROLL CAGE WITH ATLEAST THREE SEAT POSITIONS. THEN INSTALL THE CORRECT 2 POINT HARNESS AND YOU ARE GOOD TO GO. OH BUY THE WAY THE BENCH SEAT IS A BENCH SEAT FOR A REASON YOU DONT NEED SHOULDER BELTS ON A BENCH SEAT.
Remove the bolts from each corner.
The rear seat isn't designed to be removed. If you have a center bench seat you can remove that by unclipping it, then slide the rear seat forward.
Unbolt it from the floor.
remove the bolts buddy.... lol
Push rearward on the bottom of the front of bench (takes a lot of pressure) to release locking clips Lift out bench seat You will then see bolts or clips holding the back of the seat Remove or release these Lift upward on the back of the seat to release upper locking clips Remove back of seat
Push back on the bottom of the bench seat (takes a lot of pressure) to release holding clips Lift bench out Back of seat is secured by clips or bolts that are now accessible - remove these and lift upward on back of seat to release upper clips Remove seat back
Push on the bottom of the bench seat to release the clips (have to push hard) Lift bench out You will see either clips or bolts holding the rear of the seat Release these and lift rear of seat up to release upper clips to remove seat back
Push back on the front bottom of the bench (takes a lot of pressure) to release clips Lift up to remove bench, this will expose clips or bolts holding the top of the seat in place Remove bolts or clips and push up on the rear of the seat to release upper clips to remove back of seat
Yes, the bench style third row seat in older Highlanders can be replaced with split seats.
Should be a bolt in each corner under seat