This is the kit you need when you remove and install ball joints on your Bronco. In this kit you will get 93-10011 and 93-10012. Ordering this as a kit will save you $5.
91-30020 Green Grease Gun, Bronco pack for Early Ford Bronco
93-10012 Ball Joint 4wd adapter for Service Tool kit for Early Bronco
93-10013 Ball Joint Spanner Wrench for Early Bronco
93-10014 Caster/Pinion Angle Checker for Early Bronco