Based on KAON's install guide for their Rear Seat Delete Mounting Points, they should be M10 x 1.25 x 30. Check out the fitting instructions Rear Seat Delete Tie Down Points to suit Toyota LandCruiser LC200 - https://www.kaon.com.au/lc200-rear-seat-deleteDo you remember the bolt size for the anchor points you used? I saw in one of the threads but can't find it. Threw mine out with the seats.