Used these guys many times with no problems. Mac's Antique Auto Parts Great company with a nice, thick catalogue packed with Falcon stuff. Good idea to get the Mustang catalogue as well. Best source for rubber seals as they MAKE them. Classic Ford Sales A salvage yard.
Mechanics entirely dismantle some cars and sell parts.
Many parts show up on EBay. Enterprises Good source of Reproduction parts. Kanter Auto Products Source for suspension parts. A great company - quality parts with service people that will dig for needed parts. Midland Automotive Products New Original Stock and the Finest Quality Reproduction parts at affordable prices.