For (V-16) Volvo Penta 100 Drives
Outside Diameter: 4-1/4″
Mounting Holes: 3-1/8″ center-to-center
EMP Aluminum anodes conform to Mil-Spec A-24779(SH)

also crosses with:
Canada Metals CM875809A
Performance Metals 00115A
GLM 12785
Technoseal 00701AL