6 Bolt Pattern Seat for IH (Some Assembly Required). For Multiple Applications Including But Not Limited To. Case / International 274, 284, 354, 364, 454, 464, 574, 585, 674. Some models may vary and you may have to drill new holes in existing mounting platform to install this seat. Your Seat may have. 8 x 16 Mounting Bolts. 5/16″ x 3/4″ Bolts.