Lawn tractor deluxe seat Simplicity Sunrunner Whole goods part # 1691289Seat bolt pattern is 5/16 USS and is 9 1/2″ X 5 1/4″ center to center. Seat is 17″ tall and is 20″ between armrests. The item “Lawn tractor deluxe seat Simplicity Sunrunner Whole goods part # 1691289″ is in sale since Wednesday, May.