Outdrive Alignment Tool for Mercury / Mercruiser, OMC Cobra, and Volvo SX. This version comes with a hanging ring for the tool. This tool replaces the following part numbers: MerCruiser – P/N 91-805475A1 & 91-57797A3. Volvo SX – P/N 3851083. OMC Cobra – P/N 18-4442. Will work on Pre-Alpha, Alpha One, Gen 2, R, MR, All Bravo, Volvo SX, OMC Cobra Drives. Will NOT work for Mercruiser TR and TRS Outdrives. Tool Specs: According to MerCruiser service bulletin No 92-9, the alignment tool must have the following sizes from front to back: 1.010″ diameter, 2.200″ long (section that fits into coupler), 1.150″ diameter. 2.750″ long, and 1.375″diameter rest of bar (section that fits gimbal bearing inside diameter). We test all of our tools for this fit at the shop, using precision gauges and measuring tools.