Hi. Can anyone point me in the right direction to find a door filler panel for my 76 4door Deville?

I am trying to source a passenger side door filler (external
panel fits around the front door striker and conceals the rear
door hinge etc) for a 76 Cadillac 4door Deville (pillarless).

Any assistance would be greatly appreciated.

there is a 1976 4 door pillarless deville in the birmingham, al pull a part salvage yard right now. also 2 1971 devilles, a 1966 fleetwood, a 1968 deville convertible and at least 25 C body cars.