Each seat has one pair of these they are not handed and can be installed in either side, they are push fixed into the tubular section of the seat frame with a L bracket end stop to ensure it remains in place. The metal based seat cushion cross bar snap fits into this either side ensuring the seat base remains firmly in place.
After time these can get damaged with seat bases being removed on a regular basis and its a very easy part to replace to keep everything firmly held in place.
Supplied only as a pair