I used a 24v to 12v 30 amp converter they are only about 3" x 2 1/2" x 2" I bought 2 extra so if you need one you can have it for $25.00 shipped ( that's what they cost me )
Seats are new from Tractor Boy Parts 209-538-7295 $600.00 each shipped to my door ( worth every Penny )
but if you don't want armrests and the baffle cover on the bottom about $500 each
( like the picture I posted )
and you really don't need a second air compressor they only use air if you raise or lower the seat
here are the specs
Air Suspension Truck Seat
Made in USA
Mid high Back
The Heritage Series black vinyl seat with 20-inch wide cushions feature standard two-way, mechanical lumbar support, backrest adjustment, 4-position cushion for extended leg support, and seven-inch travel slide tracks.
a little tighter but I have air assist Steering so Im going to use a 5 ton wheel thats a little smaller