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Duf, I would highly recommend 3M 5200 adhesive sealant. It is by far the strongest and most resistant to the pulling and any side to side movement within the mounting holes. I have always used this for my Whalers thru the years (13, 16, 19 & 22). That said, it appears from your photos that your old bow fitting failed from a combination of salt water with crevice corrosion. Stainless is very susceptible to crevice corrosion in areas where there is little oxygen...like the twin holes in the bow. Crevice corrosion also is accelerated by force (tension) and cyclic loading is even worse (on the trailer there is both constant force and changing loading). Looks like the failure originated in the threads which are also stress concentrators. With all these things going against it, the poor fitting had no chance!!
The important thing for the future is to absolutely keep the salt water out and all the threads covered with good sealant.
Alan, i would have thought 4200 might be a better way to seal the bow holes, as my experience with 5200 is it has quite a bit of adhesive in it, and might be quite a job to remove the bow eye down the road if i ever had to. Course, if you seal the hole correctly and don't have salt water intrusion, chances are, i'll never have to mess with it again is a good point as well.
So, after installing, removing, cutting with a tad extra, reinstalling, remarking, removing recutting, reinstalling being happy, filing and working the nuts up and down, removing and putting generous amounts of 3M's 4200 all the way up to 1/2 inch from the nutted end inside the boat and all the way around the threads, reinstalled, torqued down and am satisfied with the job. Had plenty of excess sealent blow out the holes in the hull, so am good to go the voids are filled. My hands were sticky enough to know i had enough adhesion, so here's the photo's and done deal unless i get some questions.
