Behind the wood trim beneth the portlights
They are mostly thru bolted. The wood trim below the portlights hides the nuts and bolt ends. There are 4 that are not thru bolted however. They are the two that fall on the bulkhead between the head and salon on the starboard side and the aftmost ones on both sides. Those are just run into the fiberglass. VERY easy to strip!! I marked my track with red paint on these locations so I'd know not to put the car there. I'm afraid that the bolts will flex and start leaking again.You are going to want to get a BIG screw driver to remove/install the bolts. All told it was a pretty easy job. Having the first mate hold the wrench on the nut is helpfull but not necessary as you can reach through the portlight with your third hand once you get them loose. On another note, I found that this was a very good place for water to enter the boat. The design of the track makes the area around the bolt hole pretty hard to seal due to the very small contact area. You will also want to seal the boat head in the track hole to keep water from getting in that way.Good luck