Longbed sweptside demensions

[irontwist]

Are the inside bed rail measurements on a sweptside box the same on a 1961 - 1965 as my 1966 sweptside Powerwagon with both having a 8ft. box. I know the wheelbase changed from 122” to 128” and wondered if it changed box demensions. Thanks for the help

[PwrWgnDrvr]

Both 97" inside of headboard to inside of tailgate.

[irontwist]

Thanks I appreciate your help. I take it the width is the same inside rail to rail since cab width is the same?

[PwrWgnDrvr]

Close enough to the same for govt work.

[Atmobil]

I hope it's ok that I am sort of hijacking this thread as I got a very similar question.
The wheelbase went from 122" to 128", what are the differences to look out for and what do one need to convert or adapt between the two?

I'm asking because I want to convert my 65 pieplate w200 firetruck in to a pickup and I wonder if it would be possible to use the bed of an older truck. The wheels base on my w200 is 128 but what differences are there in frame and drivetrain on lets say a 64 D200 long bed utiline or sweptline?
Could I get a long (8ft) utiline box from 61 to early 65 and put my late 65 truck?

This one I can use as an example, turned up on Ebay a couple of days ago:
https://www.ebay.com/itm/1964-Dodge-Oth ... %7Ciid%3A1
I don't have the money to buy anything right now but would that cab and bed fit the W200?

[PwrWgnDrvr]

The wheel wells on an early bed are in the wrong place to use on a later truck. Tires will crowd to the front of the well, not be centered.
Cab dimensions are all the same, all yrs, all models.