Pics are in on my profile page, couldnt get them to here. Will attach to email if you wish. Dimensions: W 18 1/8″(side to side). L 19 1/4″ H 4 7/8″. Dark area on left front edge is a handhold, dark on top toward front is 2 cup holders, dark area toward rear is non-skid step area. It is hollow inside and this area can be accessed by lifting up the back end. It is fastened to boat with stainless rivets. I assume the best way to remove would be to drill out rivets. From previous comments I take it that the seat has different attaching hardware.Please advise if you have better info on how this change out should be done.