a flat fender flange isn't going to be "rubbing" against the flat bedside if the bolts are tight wink

and the welting is vinyl, felt would hold water, resulting in rot - which may be what you're seeing rather than "rubbing"

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics