Sheetmetal patches - 1963/1964 Wildcat/Lesabre coupe

Hi folks,

Trying to find some donor sheet metal to make repairs to my Wildcat. I have very solid quarter panels, except right where the panel meets the roof pillars by the rear windshield:

I would be looking for a square cut-out, about 4" back from the window, trunk extension panel to top of the fin, and then forward to the front of the roof pillar. Both sides.

Anyone have any leads? Thanks in advance.

Located some patches from a dismantler in Washington.