Corbeau has the option to add a 5th slot, otherwise known as a submarine slot, to most of the reclining seats. The 5th slot is installed in the base of the seat where you would run your submarine strap on a 5 or 6-point harness belt. Most fixed back racing seats are already equipped with this submarine slot but reclining seats are not. Having a 5th slot installed eliminates having to run the submarine strap over the front of the seat and is recommended if using a 5 or 6-point harness belt. One 5th slot is included in the price, if you have a pair of seats and need 2 slots, order 2 of this item. Photo is for reference only.