Picked up an '84 720 2WD Reg Cab Long Bed. LOVE the truck, already dropped it 3''

The truck is in pretty good condition, however, it sat with leaves in the bed for over 9 years. The bed floor has some SERIOUS rust, and for now, I just want to cover it up. I spent a good amount of time looking, but cant seem to find ANYTHING that will fit this truck. All I am looking for is the soft button up ones, nothing fancy. Please someone tell me there is one available.

1st post btw
Something like this:
