55.2-59 Panel delivery bed floor?

[68shortwide]

Is the 55-59 panel 3105 bed floor the same as a fleetside or stepside? Holley/Brothers trucks has a deal on a "1 ton" pine bed floor kit that looks halfway decent, and judging by the bottom 8" of the truck it could probably use one. I'm assuming "1 ton" floor is the lwb big boy truck and the site said it was compatible just out of error? Any insight is appreciated.