Heater Box Parts

[72jenny]

I recently found my heater core had a leak and had to replace it. When I took apart the heater box I found the metal parts the connect to the heater box to seal it were corroded pretty badly. I haven't been able to find any replacement parts for this without buying the entire heater box assembly however. My fiberglass piece is in very good condition just need the small metal piece in back where the blower motor is. Any ideas? My last resort would be trying to find something in a junkyard, though I expect that is a common corrosion area.