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MerCruiser Bearings and Shims |
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| Type | Fits | OE# | Part# |  |
| Upper Gear Bearing | R MR Alpha I Gen II | 31-35990A 1, 983891 | 18-1161 | |
| Top Cap Bearing | R MR Alpha I Gen II up to 1995 | 31-61100A 1 | 18-1165 | |
| Top Cap Bearing | Gen II 96 + up | 31-32575AT 1 | 18-1179 | |
| Lwr Forward Gear Bearing | Gen II 96 + up | 31-30894A 1 | 18-1156 | |
| Lwr Forward Gear Bearing | R MR Alpha I Gen II up to 1995 | 31-35928T A | 18-1159 | |
| Lwr Pinion Bearing | R MR Alpha I Gen II | 31-42647A 1 | 817 | |
| Needle Beaing forward Gear | I Drive | 31-32898T | 18-1115 | |
| Carrier Needle Bearing | R MR Alpha I | 31-30956T, 387247 | 18-1158 | |
| Needle Bearing forward Gear | R MR Alpha I | 31-30895T | 18-1157 | |
| Lwr Driveshaft (Drive Shaft) Bearing | TR/TRS | 31-38356A 1 | 18-1162 | |
| Upr Driveshaft (Drive Shaft) Bearing | TR/TRS | 31-48941A 1 | 18-1163 | |
| Needle Bearing Rev Gear | Gen II 96 + up counter rotation | 31-15844 | 18-1114 | |
| Upper Gear Bearing | Gen II 96 + up | 31-32573A 1 | 18-1142 | |
| Pinion Bearing | Bravo I II III Lower Driveshaft (Drive Shaft) | 31-86754T | 18-1123 | |
| Needle Bearing | Bravo I II III Bearing Carrier | 31-54042T | 18-1180 | |
| Lwr Driveshaft (Drive Shaft) Bearing | Bravo I II III SportJet & OB | 31-86745A 1 | 18-1129 | |
| Needle Bearing | Bravo I II III Upr Dr Shaft | 31-87156 | 18-1183 | |
| Shim Kit Top Cap | R MR Alpha I Gen II up to 1995 | 15-45691A 1 | 18-2283 | |
| Shim Kit Upper Pinion | R MR Alpha I Gen II, contains 1 each .002, .003, .015 & 2 each .010 | 15-36178A 1 | 18-2293 | |
| Shim Kit Upper Gear | R MR Alpha I Gen II, contains 1 each .002, .003, .005, .006, .010, .025 | 15-35980A 1 | 18-2292 | |
| Shim Kit Top Cap | Gen II 96 + up, contains 1 each .002, .003, .005, .010, .025 | 15-32593A 1 | 18-2282 | |
| Shim Kit Forward Gear | R MR Alpha I, contains 1 each .002, .003, .005, .010, .020 | 15-47397A 1 | 18-2285 | |
| Shim Kit Driveshaft (Drive Shaft) | MR Alpha I, contains 1 each .002, .003, .005, .010, .020 | 15-42637A 1 | 18-2294 | |
| Shim Kit Driveshaft (Drive Shaft) | R Alpha I (preloaded drive shaft) | 15-57007A 1 | 18-2295 | |