Sometimes to save money, car companies didn't put zirks in the joints, but usually there is a plug where you can add one, and keep them greased. if the joints were ever replaced, they either had zirks already or had them put in. if you can't find parts for an older vehicle, go online to LMC Truck--I got a lot of parts from them to restore my '90 Bronco II. They won't be Ford parts, but sometimes they are as good or better. A friend of mine priced a door gasket for his '83 pickup, and nearly choked at the price. He got one from LMC for about half the cost!