I've got Grease Gun Coupler and an https://www.rockauto.com/en/moreinfo.php?pk=1023237 for the idler arm bracket. Greasing most of the joints is now simple except for the lower control arm ball joint. The LockNLube is just a bit too big in diameter to fit right. Any suggestions on how I should take care of that? Should I put a 45° grease fitting on it? What are the grease fitting threads? M6?

They really didn't think about service when placing the grease fittings!

 

I believe the threads should be universal for the grease fittings. If you look the fittings up the thread size should be listed.