For AQ280DP, 290DP
Outside Diameter: 4-3/8″
Mounting Holes: 3-5/8″ center-to-center
EMP Aluminum anodes conform to Mil-Spec A-24779(SH)

also crosses with:
Canada Metals CM875821A
Performance Metals 00116A
GLM 12788
Technoseal 00704BISAL
Camp 875821
Reliance AMD-875821