screwing seat bases in...help

[shadow]

I got the seats and bases and pedestals,now i am gonna wait on the pedestals but the drivers seat is just going to have a base set in then one of them seats with the small spring on it put there ,there is no way to get a bolt under the bench seat so what type of screw should i use to mount the base onto the bench seat (sorry that was such a long question) ,thanks for any help
#-o

 

[bassboy1]

What material is the deck/bench seat that the base is being attached to?

 

[shadow]

aluminum

 

[Andy Taylor]

I used toggle bolts for mine. After you drill the holes for the toggle bolts to go thru bench, you will need to dig out a little foam to make room for the toggle bolts. And I used 3/4" plywood on top of the bench seat.