I have the tool (just not in my possession at the moment), and as previously mentioned, the nuts is a 32mm, and coincidentally I just happened to have a 32mm thin headset spanner (for my bike tools).
With my mom's e34, I have no problem using a screwdriver to hold the pulley, but with my car it's so tight there that I just went and bought the tool.
"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. Itís habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, Iím Nelson, and Iím a drivaholic."