For Transom bracket anode that fits Mercury/Mariner V-6 outboards, V-150 /150XR-2 (s/n 6616990 and below), V-175 (s/n 6618750 and below), V-200 (s/n 6055032 and below), V-250/275 Carb (s/n 0C101891 and above), and the V-3.4 litre.
Length: 11-1/2″
Width: 2-1/4″
Mounting Holes: 1/2″
Diameter; 1-1/2″ center-to-center.
EMP Aluminum anodes conform to Mil-Spec A-24779(SH)

also crosses with:
Canada Metals CM89949A
GLM 12720
Technoseal 00821 (zinc)