Well, since I was thinking about the boards and strips, I just had to go out with the flashlight and do some measuring -- it just couldn't wait until morning (wife's out of town so I didn't get any funny looks

).
This is what I came up with:
Number of boards: 10
Number of strips: 9
Length of boards: 107 inches
Width:
2 outside boards: 9.5 inches each
8 interior boards: vary between 7.25 and 7.5 inches each.
So it looks like I can use the 1-ton long bed boards and strips (if the bolt holes match up - those measurements will just have to wait until daylight) when it comes time to replace what I've got now. That may be a while as I'm using the truck to do some landscaping work around the house (hauling rock, dirt and busted up concrete) and wouldn't want to ding up the new boards. Also some of the neighbors have asked if I'm planning to use it for work or show (they've got work they're doing around their houses as well and I assume are wondering if I'll do some hauling for them). It'll give me a chance to drive it around a bit.
I'll just keep looking for bed materials specifically designed and built for the 1-ton stakebed.