need help...

Mike,
Here is a couple to start with.

1964 Tail Light Ford Fairlane G 4DR RH A 16631 $25 ABC Auto Salvage, Inc. USA-NE(North-Platte) 1-800-422-4683

1964 Tail Light Ford Fairlane $25 Olsen's Auto Salvage USA-IA(Rowley) 1-877-499-4174 They have both sides.