#2
i got this from their site:

The EMG-89 is a dual-mode pickup. There is no electronic filtering going on to simulate a coil tap. There are two bona fide pickups in a single humbucking housing. The single coil portion of the EMG-89 is located on the logo side of the pickup. It is identical in sound to the EMG-SA. The humbucking portion is spread across the entire pickup and sounds like the EMG-85. It's perfectly OK to rotate the pickup 180 degrees to locate the single coil portion of the pickup further away from the bridge for a "beefier" tone. You may also order the EMG-89R, which has the single-coil portion located opposite the logo.

the only difference is that the single coil is on the opposite side. im guessing the R stands for reverse.
Gear

Gibson Shred-X Explorer
Epiphone Negative Explorer w/ EMG 80/60
ESP LTD EC QM200
Ibanez RG321 w/ EMG 81/60

Peavey 5150
Mesa Boogie 4x12 Slant cab

http://www.delusionsof.com