It's not uncommon, however, to see a guitar with two EMG 81s in both bridge and neck positions (for instance, Kirk Hammett's  EMG-KH21 pickup sets, which include two EMG 81 pickups for both neck and bridge positions).
While it's not typical, some guitars feature two EMG 81s in both the bridge and neck positions (e.g., Kirk Hammett's EMG-KH21 pickup sets, which include two EMG 81 pickups for both neck and bridge positions).