Cab corners are available readily thru various suppliers...
The side panels are available but not for Longhorn...and they are very expensive..
The bed lower panels appear to be an relatively easy repair,,,take off the trim strip to get a better idea of how bad its bent..
Hint....cut a cardboard profile template using the other side bed area as a reference...
These lower bed panel sections are single panel and can usually be worked quite easily..
The cab corner is another story...if its not rusted badly,,,remove the seat and possibly the fuel tank, then use a shaped wood paddle the push the cab corner back out....
