that reinforcing plate is it, there's nothing shown in the assembly manual like you describe in the drivers door, a PO must have added it - using the regular light truck mirrors you won't have any problem, it's the big truck mirrors with long straight arms that do a lot of dancing around, and that's why there were optional 'west coast' style mirrors offered

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 & Rust-a-holics Unanimous parking lot