Lower Unit Seal Kit 

Interchanges/Replaces

GLM

• 87573

Mercury Marine

• 26-66303A1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0595	Mercury Marine 26-66303	2	Oil Seal		N/A
18-2004	Mercury Marine 26-20070 Mercury Race Outboard 26-20070	2	Oil Seal		N/A
18-2006	GLM 85330 Mercury Marine 26-33467 26-897154	1	Oil Seal		N/A
18-2019	GLM 85100 Mercury Marine 26-26805 26-27163	1	Oil Seal		N/A
18-2827	GLM 31090 Mercury Marine 27-39623 27-396231	1	Upper Face Plate Gasket		N/A
18-2828	GLM 31200 Mercury Marine 27-39625	1	Lower Water Pump 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	1	Drain Screw Gasket		N/A
18-4261	GLM 31330 Mallory 9-78002 Mercury Marine 12-20262 19643 Mercury Race Outboard 12-20262	1	Washer		N/A
18-7120	Chrysler/Force/US Marine 25-25007 25-38933 25-F498618 26-817469 27-843672 F498619 GLM 80090 Johnson/Evinrude Outboard 307853 Mallory 9-76526 Mercury Marine 25-38933 Mercury Sport Jet 25-38933 OMC Stern Drive 307853 332598	1	O-Ring		N/A
18-7163	GLM 81430 Mercruiser Stern Drive 25-33465 25-807149 25-853220 Mercury Marine 25-33465	1	O-Ring		N/A
18-7164	GLM 81260 Johnson/Evinrude Outboard 302537 Mercruiser Stern Drive 25-33466 25-67675 25-846356 27-898101789 Mercury Marine 25-33466 25-67675 25-846356	1	O-Ring		N/A
18-7180	GLM 45030 Johnson/Evinrude Outboard 303347 Mallory 9-76556 Mercruiser Stern Drive 12-31060 25-26802 25-8M2000926 Mercury Marine 25-26802 Volvo Penta 3551570 925055 926032	2	O-Ring		N/A
NSS	Mercury Marine 27-39626	1	Gasket	No Image	N/A
NSS	Mercury Marine 1	0	Water Tube Seal	No Image	N/A