I am putting a new cab kit in a John Deere 4440 with a factory hydraulic seat. I know the seat cushion bolts on the hydraulic suspension with 4 bolts, but how is the entire hydraulic seat suspension held or bolted in to the "box" in the cab? I can not see any bolts when looking in from the rear three point hitch area. Are there some tabs inside the "box"? I have some rust/corrosion on the seams of the box that the seat sits in on the lower sides. If the suspension would come out easily I would fix it from both the inside/outside. If it is a pain to remove I can just fix it from the outside. Thanks.