Hi guys, I recently found a '84 Gibson Invader (silverburst). I was hoping for yall's input since Gibson was rather useless on the phone. 1. I would like to install locking tuners (grovers, schallers, doesn’t matter)….are any of you aware of a drop in part/model number? I don't want to drill into the headstock. 2. What kind of pickups are in it? I can’t find much info other than some people saying Dirty fingers and others saying Sonex 180.....i bought some Gibson '57s, do yall think these would work well? Thanks a lot and hopefully someone can help me out.