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You should have a fitting on the upper, lower ball joints, inner, outer tie rod, pitman to centerlink, idler to centerlink, possibly a fitting in your u-joints on drive shaft if they have been replaced. Not sure about the frequency tho.
There is also one on the front driveshaft slip splines. There are 2 grease fittings on the idlerarm. I normally grease whole front end every oil change/tire rotation.