MEASURE the pole spacing. Some Gibsons have 53mm and if someone has put a TonePros in there it would most likely be 53mm.
I have an alnico Nailbomb in my Explorer, sounds excellent. I found the Warpig a bit too dark there. Mine have the long legs and work okay. Long legs can be an issue in the neck spot though with the pickup bottoming out. I would recommend taking your pickups out and having a look