PN: 9904106591 Fits these models: AP 308 AT 400 AT 400E AT 414 AT 420 AT 422 AT 422E AT 425 AT 750B RT 600C RT 630C RT 633C RT 635C RT 640E RT 650E RT 700B RT 725B RT 727.5 RT 730B RT 733B RT 735B RT 740 RT 740B RT 744B TMS 750B