where to get inner door panels?
 

my dads restoring a 63 long/fleetside and is having some trouble finding the inner door panels. anyone know a good place to get em?

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69 1/2 ton, 350ci/th400, change from long/fleet to short/fleet, shaved door handles, custom sounds, dual headman blockhuggers/flowmasters exhaust, shaved tailgate, 18" budniks with matching steering wheel, 4/6 drop, power windows