Hey Chris,
bit of a Hetfield anorak lol. He got sponsored by ESP after Ride the Lightning was recorded and has used ESP Explorers since (save two ULTRA valuable Ken Lawrence handmade jobs). He has also used EMG 81/60 pretty much in all guitars since (he used a Jackson, later to be King V on MOP as well as two white gibbo explorers).
As for today he has re-finished a orig. '76 Explorer to flat black with rusty pickguard (nicknamed Rusty) and to his 'moving toggle switch' specs but still with 81/60 EMG's.
As for St.Anger he got abit 'crazy' with guitars, not just using Mesa's either, been using a Diezel head amongst others.
Reckon MM for bridge, not sure about neck, either calib. MM set or summt like CS or Mule maybe?