I'm curious about this too. Looking at seats for my jon boat also. Like has been already mentioned remember to use Stainless Steel screws on that aluminum boat....it'll save you headaches down the road (i.e. holes in your boat from corrosion:crazy:).
Here are a couple of opions for a way to mount the seats with a little versatility.
Follow the link that Dave posted above for some good information on threadserts, etc for fastening them to anywhere you can not access the back side.
Here are the pictures of the mounts.
I was thinking mounting the pedestal base, and using a male adapter bolted to the seat. "I have no need for extension rods"
i want to mount a pedestal base on the rear bench seat, and also on both sides of the livewell. that way when i fish from the rear of the boat i'll have the entire back open for fishing. Hope this makes since.
What I call pedestals, you call extension rods.:smile2:In any case, they can put a lot of stress on the bases, and associated fasteners.
With just the base and adapter, that's not so much of a problem...unless you really plan on abusing the seat, screws should be fine. Be aware that the aluminum the seat is made of will be pretty thin...maybe .070", or so...easy does it on those screws.
Those components you linked are available at WalMart, btw.
The seats come with threaded inserts pressed into the bottom of the seat that you use to bolt the base on with. It is my experience to just go ahead and take them out when they are new. Take the cushion off the seat and drill holes all the way through the bottom of the seat where the inserts were. Use 1/4" bolts, washers and lock nuts to go all the way through the bottom of the seat and hold the base on. Then put the cushion back on. If you can only afford the cheap seats like me, the threaded inserts do not last. Maybe the expensive seats are a little better in this area.
If you can get to the underside of what you're mounting them to, I'd through bolt them with a nut and washer. Tek screws will work but as Katmandeaux said, the aluminum is thin and they'll tend to strip or pull out after a while of leaning back in the seat.