Fits 2019+ Yamaha boats with the factory installed Swim-Up Seat mount under the swimdeck.
This is part of the new JEWLS Customs Swim-Up Seat Modular System.
This is where the "modular" portion of the system comes in. You only need to buy this once, because everything mates up to this.
The rectangular portion slides into the swim-up seat mount under the swim deck, and a piin holds it in place.
The holder then slips onto the round portion and is held in place with a thumb screw, which also provide a bit of vertical adjustment.
Pin and Thumscrew incuded.