#2
Yes, I put Grovers on My SE Standard and its problem-free
PRS Standard 22, Trans Blue
PRS Custom 24, Eriza Verde Green
Martin DC16 GTE Acoustic/Electric
Segovia Acoustic/Electric
Marshall JCM 900 Dual Reverb
Fender Princeton Chorus 212
#3
the only way you can know is to take one of yours off and measure the hole.
Belief is a beautiful armour but makes for the heaviest sword.