Lower Rear Quarter Patch Repair

Hello Everyone,

I'm delving into the final body repair on my 74 Dart Sport and am hoping for a little direction from the experienced.

I have cut out a section of my rear lower quarters just in front of the rear tire where there was some substatial rot. I'm certain I will need to cut out a bit more around the edges near the wheel well, but other than that I feel like the remaining sheet metal is solid. I also plan to drill out the spot welds on the seam at bottom and removing everything below the hole I cut.

I've searched around for patches, but was not able to find anything other than full rear quarters which is overkill.

Does anyone know if there are patches available to purchase that I missed, or will this require a donor?

Pictures attached (one from the drivers side, one from the passenger side), and thanks in advance for any help.

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