For most Mercury/Mariner 35 HP and above, Force 90/120 (1995 and newer) plus all MerCruiser Drives.
Diameter: 3-1/2″
Mounting Hole: 7/16″-14 thread.
EMP Aluminum anodes conform to Mil-Spec A-24779(SH)

also crosses with:
Canada Metals CM46399A
GLM 12680
Technoseal 00804 (zinc)
Camp 46399
Reliance AMD-46399