Oh no trouble in Paradise! Caveat emptor or DO NOT always trust that the manufacturer has taken the time to do things right. This is an utter embarrassment to the folks at Westerbeke and is plain and simply SLOPPY, especially when this "upgrade" is supposed to address deficiencies in design and installation.
I spoke with Bob B. at Westerbeke about this at the 2013 Annapolis Sailboat Show and HOPEFULLY they have now addressed this issue. Still be on the look out for sloppy fitting pivot bolts. The Devil is always in the details.
Many owners of the M-25's have alternators as large as 100A or more on these engines. Install an alternator with a sloppy fitting pivot bolt like this and you are asking for trouble. The alternator will have chronic alignment issues and will eventually oblong the pivot hole in the alternator thus potentially ruining the case.. SHAME ON Westerbeke!
The bolt passing through the alternator ear AND the bracket MUST be a proper fit. This is NOT a proper fit..