• Brand: Green Bay Prop
• Condition: New
• MPN: GB450030300

Part number 31-12578.

Needle Roller Bearing

For the gear housing on many 30-150HP Mercury, Mariner, Force outboard engines.

New Mercury part, old stock. Not an aftermarket. Showing some minor surface rust from being in storage.

Mercury 31-12578 supersedes to 12578T.

Over 250 Mercury/Mariner/Force outboards use this bearing. Listed below are some of the models.

100 (4 CYL.) 0A722297 THRU 0D283221 (MARINER)
100 (4 CYL.) 0B209468 THRU 0D283221 (MERCURY)
100 (4 CYL.) 0D283222 THRU 0G760299 (MARINER)
100 (4 CYL.) 0D283222 THRU 0G760299 (MERCURY)
100 (4 CYL.) 9523034 THRU 9793576 (MARINER)
100 (4 CYL.) 9523034 THRU 9793576 (MERCURY)
100 (4 CYL.) 9793577 THRU 0P016999 (MARINER)
100 (4 CYL.) 9793577 THRU 0P016999 (MERCURY)
115 (4 CYL.) 0C100000 THRU 0D283221 (MARINER)
115 (4 CYL.) 0C100000 THRU 0D283221 (MERCURY)
115 (4 CYL.) 0D283222 THRU 0G760299 (MARINER)
115 (4 CYL.) 0D283222 THRU 0G760299 (MERCURY)
115 (4 CYL.) 9559771 THRU 9793576 (MARINER)
115 (4 CYL.) 9559771 THRU 9793576 (MERCURY)
115 (4 CYL.) 9793577 THRU 0P016999 (MARINER)
115 (4 CYL.) 9793577 THRU 0P016999 (MERCURY)
120 H.P. (1990-1994) 0E000001 THRU 0E093699 (FORCE)
120 H.P. (1996) 0E138600 THRU 0E202999 (FORCE)
120 H.P. (1997) 0E203000 THRU 0E287999 (FORCE)
120 H.P. (1998) 0E288000 THRU 0E344999 (FORCE)
120 H.P. (1999) 0E345000 THRU 0E369299 (FORCE)
120 Hp (1995) 0E093700 THRU 0E138599 (FORCE)
125 (4 CYL.) 0D283222 THRU 0G760299 (MARINER)
125 (4 CYL.) 0D283222 THRU 0G760299 (MERCURY)
125 (4 CYL.) 9793577 THRU 0P016999 (MARINER)
125 (4 CYL.) 9793577 THRU 0P016999 (MERCURY)
150 H.P. (1989-1992) 1989-A THRU 1992-C (FORCE)
150 H.P. (1992-1994) 0E000001 THRU 0E093699 (FORCE)
40 (4-STROKE) 0G231123 THRU 0G760299 (MARINER)
40 (4-STROKE) 0G231123 THRU 0G760299 (MERCURY)
40 (4-STROKE) 9944807 THRU 0P016999 (MARINER)
40 (4-STROKE) 9944807 THRU 0P016999 (MERCURY)
40 ITALY (4-STROKE) 0G760300 THRU 0T178499 (MARINER)
40 ITALY (4-STROKE) 0G760300 THRU 0T178499 (MERCURY)
40 ITALY (4-STROKE) 0P017000 THRU 0P094499 (MARINER)
40 ITALY (4-STROKE) 0P017000 THRU 0P094499 (MERCURY)
45 BODENSEE (4-STROKE) 0G231123 THRU 0G760299 (MARINER)
45 BODENSEE (4-STROKE) 0G231123 THRU 0G760299 (MERCURY)
45 BODENSEE (4-STROKE) 0G760300 THRU 0T178499 (MARINER)
45 BODENSEE (4-STROKE) 0G760300 THRU 0T178499 (MERCURY)
45 BODENSEE (4-STROKE) 0P017000 THRU 0P094499 (MARINER)
45 BODENSEE (4-STROKE) 0P017000 THRU 0P094499 (MERCURY)
45 BODENSEE (4-STROKE) 9944807 THRU 0P016999 (MARINER)
45 BODENSEE (4-STROKE) 9944807 THRU 0P016999 (MERCURY)
45 JET 0D000750 THRU 0G290584 (MARINER)
45 JET 0D000750 THRU 0G290584 (MERCURY)
45 JET 0G290585 THRU 0G589999 (MARINER)
45 JET 0G290585 THRU 0G589999 (MERCURY)
45 JET 0G590000 THRU 0G760299 (MARINER)
45 JET 0G590000 THRU 0G760299 (MERCURY)
45 JET 9683055 THRU 9885344 (MARINER)
45 JET 9683055 THRU 9885344 (MERCURY)
45 JET 9885385 THRU 9973099 (MARINER)
45 JET 9885385 THRU 9973099 (MERCURY)
45 JET 9973100 THRU 0P016999 (MARINER)
45 JET 9973100 THRU 0P016999 (MERCURY)
50 (3 CYL.) 0D000750 THRU 0G290584 (MARINER)
50 (3 CYL.) 0D000750 THRU 0G290584 (MERCURY)
50 (3 CYL.) 0G290585 THRU 0G589999 (MARINER)
50 (3 CYL.) 0G290585 THRU 0G589999 (MERCURY)
50 (3 CYL.) 9683055 THRU 9885344 (MARINER)
50 (3 CYL.) 9683055 THRU 9885344 (MERCURY)
50 (3 CYL.) 9885345 THRU 9973099 (MARINER)
50 (3 CYL.) 9885345 THRU 9973099 (MERCURY)
50 (4-STROKE) 0G231123 THRU 0G760299 (MARINER)
50 (4-STROKE) 0G231123 THRU 0G760299 (MERCURY)
50 (4-STROKE) 0G760300 THRU 0T178499 (MARINER)
50 (4-STROKE) 0G760300 THRU 0T178499 (MERCURY)
50 (4-STROKE) 0P017000 THRU 0P094499 (MARINER)
50 (4-STROKE) 0P017000 THRU 0P094499 (MERCURY)
50 (4-STROKE) 9944807 THRU 0P016999 (MARINER)
50 (4-STROKE) 9944807 THRU 0P016999 (MERCURY)
50 BIGFOOT (4-STROKE) 0G231123 THRU 0G760299 (MARINER)
50 BIGFOOT (4-STROKE) 0G231123 THRU 0G760299 (MERCURY)
50 BIGFOOT (4-STROKE) 0G760300 THRU 0T178499 (MARINER)
50 BIGFOOT (4-STROKE) 0G760300 THRU 0T178499 (MERCURY)
50 BIGFOOT (4-STROKE) 0P017000 THRU 0P094499 (MARINER)
50 BIGFOOT (4-STROKE) 0P017000 THRU 0P094499 (MERCURY)
50 BIGFOOT (4-STROKE) 9944807 THRU 0P016999 (MARINER)
50 BIGFOOT (4-STROKE) 9944807 THRU 0P016999 (MERCURY)
55 (3 CYL.) 0D000750 THRU 0G290584 (MARINER)
55 (3 CYL.) 0D000750 THRU 0G290584 (MERCURY)
55 (3 CYL.) 0G290585 THRU 0G589999 (MARINER)
55 (3 CYL.) 0G290585 THRU 0G589999 (MERCURY)
55 (3 CYL.) 0G590000 THRU 0G760299 (MARINER)
55 (3 CYL.) 0G590000 THRU 0G760299 (MERCURY)
55 (3 CYL.) 9741042 THRU 9885344 (MARINER)
55 (3 CYL.) 9741042 THRU 9885344 (MERCURY)
55 (3 CYL.) 9885345 THRU 9973099 (MARINER)
55 (3 CYL.) 9885345 THRU 9973099 (MERCURY)
55 (3 CYL.) 9973100 THRU 0P016999 (MARINER)
55 (3 CYL.) 9973100 THRU 0P016999 (MERCURY)
60 (3 CYL.) 0D000750 THRU 0G290584 (MARINER)
60 (3 CYL.) 0D000750 THRU 0G290584 (MERCURY)
60 (3 CYL.) 0G290585 THRU 0G589999 (MARINER)
60 (3 CYL.) 0G290585 THRU 0G589999 (MERCURY)
60 (3 CYL.) 0G590000 THRU 0G760299 (MARINER)
60 (3 CYL.) 0G590000 THRU 0G760299 (MERCURY)
60 (3 CYL.) 9683055 THRU 9885344 (MARINER)
60 (3 CYL.) 9683055 THRU 9885344 (MERCURY) .