I have a wing keel 34+. Yes there is one (maybe two) directly under the mast step casting. There are also at least two under the aftmost piece of cabin sole that's between the companionway steps and the removable bilge panels.
Crap. Thanks man.
You having problems with the bolts? I've been thinking of taking the mast step off before the rig gets stepped just to take a good look at them (something I haven't yet done).