MERCURY OEM STERNDRIVE, BRAVO I XR SM (1.50:1 RATIO) ( LONG - STANDARD) *{- NOTE: THE COMPLETE BRAVO I SPORTMASTER DRIVE UNITS ARE NO LONGER AVAILABLE. ORDER DRIVESHAFT HOUSING ASSEMBLY 1589-865440H56 AND LOWER GEAR HOUSING ASSEMBLY 1600-883608T33. SN# 0M955633 - 5F36201HH | boats.net