FORCE : 50 H.P. (1989) Model Serial Ranges 504D9B 504P9B 507A9B 507A9C 507A9D 507D9B 507F9B 507F9C 507F9D 507H9B 507I9B 507K9B 507L9B 507P9B 507R9B 507X9A 507X9B 507X9C 507X9D 507Y9B 508F9C 508F9D 0C507F9B