For MerCruiser R, MR, Alpha One Gen II, Bravo series, X, XR and XZ Drives, fits at the base of the gimbal housing.
Length: 4″
Width: 3″
Mounting Holes: 1-3/8″ center-to-center.
EMP Aluminum anodes conform to Mil-Spec A-24779(SH)

also crosses with:
Canada Metals CM821631A
Performance Metals 00045A
GLM 12713
Technoseal 00806BISAL
Camp 43994, 821631
Reliance AMD-821631