Please allow me to but in here and change the subject slightly. Does anyone know if the sheetmetal that holds the cowl vents is replacable. I have two spots on each side adjacent to the windshield seal that is about to rust through. Any help is appreciated.

75 240D "Raggedy Ann" (junked-engine reused in Pearl)
'75 240D "Pearl" (sold)
'80 300D "Ms Lewis" (bought and sold for $400 after I drove for 3 years)
'85 300TD "Tunces" (best car ever built)
'85 300CD Wife's car and new to us and has yet to claim a name