Stacks on a F550 dual axe flatbed?

[Tim S]

hey guys, new to the forum here and was wondering where i could buy a dual exhaust stack kit for my Ford. ive looked around everywhere and couldnt find a thing. though mabye someone here could navagate me to where to get some. id prefer 5" or bigger, and to have them go around the bed so no work would be done on it. like stated, the truck is a 1994 ford 7.3 F550 dual axle flatbed, two door cab. thanks guys