panel truck or canopy seats

[trucktony]

Hello There
I bought a pair of seats for (I hoped) my 58 panel truck
But I am not sure if the will fit
Glad with them anyways
Can someone tell me from which truck these came from
I got them at an yard sale
My thoughts were they came from a 39-46 chevy panel or canopy
I saw a couple on ebay exactly the same and these had a body by fisher emblem on them
I think the backrest lever and slider configuration will be the telltale
I hope someone can help me on this one because if they are that old I want to preserve them for the original panel truck and/or canopy
And don't weld or cut on them to make them fit
There will be more in the future

Thanks for every help or photo that links me to the make and car/truck that they are from
Tony