Check out any of the seven Seat(m9f/maf) components enlisted.
The Nut,flanged,lock,8mm is the cheapest item from this partsfiche.
The Kaf620-maf Mule4010 2010 Usa / 4x4 Seat(m9f/maf) consists of seven pieces with the Seat-assy,back,black being the most expensive.