72 Fleetside LWB tool box

[lrader99]

the bed side where the box hinges mount the whole thing is rotted out does anyone know where i can get a bedside with the tool box option or does or is there a patch panel? also i need a new fiberglass box, the mountings are all screwed up. I have what i think was a custom ordered truck and im trying to put it back original. Let me know what you think

Factory ordered options were as follows:
Black paint w/ white striping
blue vinyl interior
wood grain molding
cheyenne package
400 SBC
posi rear end
cab lights
long bed
bedside tool box

theres a bunch of other RPO's but this combination seems strikingly strange
any help would be awesome