Tony, the upper rear ball joint is the only one of the 3 that has a slot-opening. The others have a circular opening, so no orientation problems up front. Note that adding screw-in zerk grease fittings to the ball joints and tie rod ends is one of the very first mods done to Panteras- back in the early '70s when they were new. Sure adds life to the assemblies and reduces steering effort.
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