These are 1" diameter x 2.5" length. The keel is countersunk so the bolts sit flush to it. Apparently Schock is still using the same bolts with the exception that the new ones are now 3" length. This means I will have to cut them which will be no small job considering they are SS.
I am a big believer in the theory of "if it's not broke, don't fix it." which is why if I pull another and it looks as good as the first then I will delay cutting and installing the remaining 8.