For V17 Volvo Penta 250-270 Outdrives
Outside Diameter: 4-5/8″
Mounting Holes: 3-1/8″ center-to-center.
EMP Aluminum anodes conform to Mil-Spec A-24779(SH)

also crosses with:
Canada Metals CM875806A
Performance Metals 00114A
GLM 12784
Technoseal 00702AL