For the transom plate nuts for MerCruiser MC-I, R, MR, Alpha and Bravo Drives (serial number 0D469828 and below)
Anode O.D.: 1-1/4″
Length: 1-1/8″
Thread Size: 1/2″-13.
EMP Aluminum anodes conform to Mil-Spec A-24779(SH)

also crosses with:
Canada Metals CM55989A
Performance Metals 00050A
GLM 12700
Technoseal 00807AL
Camp 55989
Reliance AMD-55989