I have a 1997 F350 foot bed and wondering what other years will match up to this bed because I need to change mine due to rust

 

How many foot ???? BTW, Google would find your answer quickly !

 

1997 F-350s only came from the factory with 8' beds if they had a bed.

I think 1992-1997 F-250 and F-350 8' beds are all structurally the same.

 

Being a 350 and a crew cab with a flat bed the truck could be a cab chassis truck and a pick up bed would not fit as the frame rails are different between pickup & CC trucks.
Find a pickup and measure how wide the rear frame I'd then your truck.
Dave ----