Additional Details:

• For: #1 Units (including Alpha)(Also fits 888 stern drive)

Interchanges/Replaces

GLM

• 87500

Mallory

• 9-74303

Mercruiser Stern Drive

• 26-32511A1
• 26-32511B1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0894	GLM 31150 Mallory 9-60037 Mercruiser Stern Drive 27-55810 27-558101	1	Water Pocket Cover Gasket		N/A
18-2003	GLM 85030 Mallory 9-76102 Mercruiser Stern Drive 26-32080 26-36054 26-68493 26-823894 26-823894B	1	Oil Seal		N/A
18-2049	GLM 85020 Mallory 9-76111 Mercruiser Stern Drive 26-32511	1	Oil Seal		N/A
18-2056	Chrysler/Force/US Marine 26-66302 GLM 85060 Mallory 9-76130 Mercruiser Stern Drive 26-37259 26-89237 26-96503 26-965031 Mercury Marine 26-56394 26-66302	1	Oil Seal		N/A
18-2944	GLM 85140 Mallory 9-76512 Mercruiser Stern Drive 26-45577 26-455771 26-45577B 26-45577B1	1	Seal Ring Gasket		N/A
18-2945	Chrysler/Force/US Marine 12-19183 F50556 F8077 F8186 Johnson/Evinrude Outboard 307552 Mallory 9-60101 9-60102 Mercruiser Stern Drive 12-19183 12-191832 12-191833 12-19183B 12-20260 12-20260B Mercury Marine 12-19183 12-191832 12-191833 12-20260	2	Drain Screw Gasket		N/A
18-3110	GLM 12830 Mallory 9-43604 Mercruiser Stern Drive 26-38970 Mercury Marine 26-29677 26-36557A1 26-38970	1	Water Pump Housing Bushing		N/A
18-7153	GLM 81180 Mallory 9-76505 Mercruiser Stern Drive 25-25439 Mercury Marine 25-25439 Mercury Race Outboard 25-25439 Mercury Race Sterndrive 25-25439 OMC Stern Drive 3852565 911851 Volvo Penta 3852565 997368	2	O-Ring		N/A
18-7161	GLM 80420 Mallory 9-76546 Mercruiser Stern Drive 25-32546 Mercury Marine 25-32546	1	O-Ring		N/A
18-7169	Chrysler/Force/US Marine 25-F24278 GLM 82380 Mallory 9-76551 Mercruiser Stern Drive 25-35984 25-70937 OMC Stern Drive 911686	1	O-Ring		N/A
18-7445	GLM 80190 Mallory 9-76568 Mercruiser Stern Drive 25-55801	1	O-Ring		N/A
18-0521	GLM 85150 Mercruiser Stern Drive 26-36557 Mercury Marine 26-36557	1	Water Tube Rubber Seal		N/A

Additional Details:

• Ratio: 1.50:1
• Fits: R, MR, Alpha One & SS (1983-1990)
• Drive Gear: 22 teeth
• Driven Gear: 20 teeth

Interchanges/Replaces

GLM

• 11215

Mallory

• 9-79202

Mercruiser Stern Drive

• 43-803116T1
• 43-803117T1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-1142	GLM 21560 Mercruiser Stern Drive 31-32573A1	1	Upper Pinion Bearing		N/A
18-1160	GLM 21520 Mallory 9-75123 Mercruiser Stern Drive 31-35988A12 31-35988A2	1	Drive Bearing Kit		N/A
18-1165	GLM 21510 Mallory 9-75117 Mercruiser Stern Drive 31-61100A1	1	Tapered Roller Bearing		N/A
18-2201	GLM 11210 Mercruiser Stern Drive 43-18410A2 43-18411A2 43-59832A2 43-59832A4	1	Upper Unit Gear Set		N/A
18-2619-1	GLM 39620 Mallory 9-62601 9-62601-25 Mercruiser Stern Drive 27-64818A2 27-64818A3 27-94996 27-949962 27-94996A1 27-94996A2 27-94996Q2	1	Outdrive Gasket Set		N/A
18-2648	GLM 87500 Mallory 9-74303 Mercruiser Stern Drive 26-32511A1 26-32511B1	1	Upper Unit Seal Kit		N/A
18-2820	Mercruiser Stern Drive 27-45821 27-64818 27-64818A1 27-64818A20 27-64818A4 27-64818Q4	1	Outdrive Gasket		N/A

Additional Details:

• Ratio: 1.98:1
• Drive Gear: 20 teeth
• Driven Gear: 24 teeth
• For: 120/140

Interchanges/Replaces

GLM

• 11245

Mallory

• 9-79203

Mercruiser Stern Drive

• 43-803101T1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-1160	GLM 21520 Mallory 9-75123 Mercruiser Stern Drive 31-35988A12 31-35988A2	1	Drive Bearing Kit		N/A
18-1161	GLM 21540 Johnson/Evinrude Outboard 983891 Mallory 9-75122 Mercruiser Stern Drive 31-35990A1 OMC Stern Drive 983891	1	Tapered Roller Bearing		N/A
18-1165	GLM 21510 Mallory 9-75117 Mercruiser Stern Drive 31-61100A1	1	Tapered Roller Bearing		N/A
18-2205	GLM 11240 Mercruiser Stern Drive 43-55766A2 43-55766A3 43-55778A3	1	Upper Unit Gear Set		N/A
18-2619-1	GLM 39620 Mallory 9-62601 9-62601-25 Mercruiser Stern Drive 27-64818A2 27-64818A3 27-94996 27-949962 27-94996A1 27-94996A2 27-94996Q2	1	Outdrive Gasket Set		N/A
18-2648	GLM 87500 Mallory 9-74303 Mercruiser Stern Drive 26-32511A1 26-32511B1	1	Upper Unit Seal Kit		N/A
18-2820	Mercruiser Stern Drive 27-45821 27-64818 27-64818A1 27-64818A20 27-64818A4 27-64818Q4	1	Outdrive Gasket		N/A

Additional Details:

• Ratio: 1.65:1
• Drive Gear: 24 teeth
• Driven Gear: 24 teeth
• For: 6 cyl Inline

Interchanges/Replaces

GLM

• 11225

Mercruiser Stern Drive

• 43-803112T1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-1160	GLM 21520 Mallory 9-75123 Mercruiser Stern Drive 31-35988A12 31-35988A2	1	Drive Bearing Kit		N/A
18-1161	GLM 21540 Johnson/Evinrude Outboard 983891 Mallory 9-75122 Mercruiser Stern Drive 31-35990A1 OMC Stern Drive 983891	1	Tapered Roller Bearing		N/A
18-1165	GLM 21510 Mallory 9-75117 Mercruiser Stern Drive 31-61100A1	1	Tapered Roller Bearing		N/A
18-2203	GLM 11220 Mercruiser Stern Drive 43-45814A5 43-55765A2 43-55765A3	1	Upper Unit Gear Set		N/A
18-2619-1	GLM 39620 Mallory 9-62601 9-62601-25 Mercruiser Stern Drive 27-64818A2 27-64818A3 27-94996 27-949962 27-94996A1 27-94996A2 27-94996Q2	1	Outdrive Gasket Set		N/A
18-2648	GLM 87500 Mallory 9-74303 Mercruiser Stern Drive 26-32511A1 26-32511B1	1	Upper Unit Seal Kit		N/A
18-2820	Mercruiser Stern Drive 27-45821 27-64818 27-64818A1 27-64818A20 27-64818A4 27-64818Q4	1	Outdrive Gasket		N/A