Mine would not come out......I am sure Ford has made them all different ways. If you want to raise the seat any more than about two inches, the existing bolts will not be in the way anyway. Just drill new holes on the seat bracket (about 1 1/2 inch behind before you jack the seat up with whatever you are using......at least in my F350, the space is not missed at all.
I wanted to mount the amps on a rack behind the seat at first, but the 2003 f350 is very limited on space under the seat.....so I went the reverse of that originally idea. The way the seat is made.....the amps fit right up in the seat frame. Virtually impossible to get to without taking the back seat out. I like that because it is not a neat, quick package for the thieves.....
The sub box is 9 1/2 inches at the bottom and provides approximately 1.1 cubic feet per sub. I am planning on using 3/4 " spacers to get all the volume I can and change out the cvt's to something better in the future. Behind the seat is all I could figure for subs in my truck....except for a sub in box that is no more than 4" deep by about 12". That would really limit things. Raising thee seat would also limit my vision out the back. My seat is already two inches up the rear window.