Because Ed's also sells seat hardware kits using carriage bolts.
The picture looks as if they are #10 size machine screws. You can find out easily enough by either calling Ed's or going to a hardware store and holding your bolts up against a number 10 machine screw.
It makes no difference if your bolts are coarse thread (24 tpi) or fine thread as long as the nuts fit on. The picture looks like coarse thread.
Yes, the dished washers in the picture are what are called finish washers. The larger flat washers are called fender washers.
The Kayak Wing
Sport Cases (Electronics)
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