Heater Box Issue

[Gary AAR]

I am working on restoring the heater box from my 1970 Cuda (non-A/C).  The housing half shown in the pictures below are of an area where a portion of the housing was broken off (see circled area in the photo).  Anybody have a similar picture of an undamaged housing so that I know what the profile shape should be in this area?  What would be the best approach to fixing this area (fiberglass?, squaring up the broken edge and gluing a piece of plastic on and then fiberglass over the top?, other ideas????)?
Thanks for the help.

[Burdar]

They make a replacement if you want to go that route.  Then you can reproduce the date stamps.
https://dantesparts.com/i-30497641-mopar-e-body-heater-core-housing.html

I found this picture just by doing a Google search.
https://picclick.com/1970-74-E-Body-Heater-Box-70-71-72-401623170647.html

[71vert340]

From my 71 non-A/C. I've got others.
Terry

[71vert340]

This shows the curve upward.
Terry

[Gary AAR]

Thanks for the pictures.  They are exactly what I was looking for.