For all Volvo Penta 130/150 saildrives, including 2017 and later -C and -D saildrive models 130S-C, 130SR-C, 150S-C, and 150SR-C, 130S-D, 130SR-D, 150S-D, and 150SR-D.
Diameter: 4″
EMP Aluminum anodes conform to Mil-Spec A-24779(SH)

also crosses with:
Canada Metals CM22651246Z
Technoseal 00734-1AL