Got it!
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I discovered a hole in the right door jamb, where someone had apparently cut out some rust between the latch post and the inside of the door opening and never got around to patching (is the car still considered "rust free" if there are holes where the rust was cut out?).
Does anyone have a section of right door jamb that includes the whole latch post recess and extends to the inside of the door opening? The piece would be about 4" x 4" or so.
Yes, I know I can order a new panel from Restoration Design, but thought I'd ask here first, just in case someone has a piece laying around.
Thanks!