All of our Rac compatible inflatable boards include one set of slide-in Aero Rac­ Receivers, allowing the use of BOTE Rac Systems (check Rac pages for board compatibility). Simply slide these into the receiver plates on your Rac compatible inflatable board and it's ready for the water. The Rover Aero comes with two sets of receiver plates, allowing you to add another BOTE Rac with the purchase of an extra pair of Aero Rac Receivers. Slide-In Aero Rac Receivers are backwards compatible with older model inflatable boards that require Screw-In Aero Rac Receivers.