LFR5A's are correct. Now were they just not installed all the way, dono, but they're not going back in that's for sure. Gonna get some new ones and see how far down they screw!
If I were you I would run a spark plug tap in the holes and clean the threads up before trying to install the new plugs.
Live Simply, Love Generously, Care Deeply, Speak Kindly, and Trust in our Creator who Loves us