Inner fender support interchangeability

[Orange67]

I’m having trouble finding the metal inner front fender supports. Finding a regal support or complete fender in my area is nonexistent and junkyard locators have been a dead end. Does anyone know if a Cutlass or other G body inner fender structure will interchange with a Regal? For context, it’s the metal support on the drivers side fender that the horn and relays are mounted to and the fiberglass inner fenders bolt up to