Replacing 69 bed floor w/ 90 bed floor..need measurements.

[Bleach]

I have a line on a SWB 1990 bed that a guy will sell me for 200 bucks. I only want it for the sheetmetal in the floor to use in my 69. I know that the older trucks have a narrower bed. So...I need the following.

I need to know if the 1990 has enough bed sheetmetal to cover everything, wheel wells are my concern.

I also need to get some kind sole to give me some measurments, advice, pics..etc. What I really need are the measurements of the true dimensions of a 69-72 SWB fleet bed floor.

This won't happen for a while, but if this will work I need to go ahead and pick up this bed while I can.

Thanks in advance!