Anodes are not like batteries. You can mix manufacturers with no problems.
The Boatzincs site shows that the N15 zinc anode has a 3.1" center to center dimension for the two holes. Several aluminum anodes have 2-7/8" center to center dimensions that could easily be enlarged to fit and a couple are slotted that would work with no modifications, like the Mini Diver's Dream. So pick the one that fits with your available outside room.
Davod
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