Last night was changing oil and noticed only 2 front grease fittings. Pulled out Haynes manual and shows should be 9. Found 4 "should be's" on ball joints each side. Can't figure out where other 3 should be? Anyone know what size fittings needed for ball joints? Why are the fittings not already in? Needed?

Know this sounds very basic and maybe even stupid but I'm confused why grease fittings not already on a 99 and given found 4 missing, where else to look.

truck is 99 4x4