RX8 seats fit perfectly, and you have room to keep the middle seat in without any modification!
I wired my driver seat in to the battery permanently (I have a bank of perm lives under the passenger seat)
to access the battery under passenger there is 4 bolts into the base of the passenger seat (goldish coloured ones)take all them out and the ass of the seat comes away completely. leave the back to off completely, and put the front two in HAND TIGHT (trust me) if you have to edge of the rail flush with edge of box you will be able to slide seat forward for easy access to the hand tight bolts and the base comes out giving you full access to battery box!
You need to take off pretty much all the brackets, drilling out the meaty rivets (they were a pain in the back) but do not grind them incase you set fire to the foam.
on the driver seat you need to keep the gold rivet and bracket in the middle to make sure the rail still spins into the driver to slide foward and backward (i made that mistake)
you need to know this to make electrics work
Seat Motion
Grey - +12v
Purple - Ground
Lumbar
Yellow w/red stripe - +12v
White w/yellow stripe Ground
Seat Heater
Blue - +12v
Passenger seat
Seat heater
Red +12v
Black - ground
Heated seats work, 12v is 12v, just have a on off switch in line so they do not burn out