This kit, mounted to the underside of an existing seat, allows the seat to slide forward and backward. Three slide rails, two “U” brackets, spacers, and stainless steel hardware are included. Most installations require two rails, one end attaching to a yoke or thwart, the other to the gunnel. When the yoke or thwart is not within reach, a third rail is used to mount gunwale to gunwale. This kit may be purchased with or without a seat.