I can confirm what Bernie said about the distance from center in a two blade wiper setup. ie. 220 mm from center to each bezel.
However, I have a 120 degree sweep motor which is what seems to be the desired angle for 2 wiper setups. This motor parks to the right, therefore wipes the whole area in front of the driver. This angle allows a good overlap of the blades and wipes to approx 100mm of the far left of the screen
You can change the sweep if you want. see here:
http://www.erareplicas.com/427man/wiper/index.htm
I dont know the distance from center for a three wiper system but I do know that the motor must wipe a lesser angle. If it didnt the left wiper would wipe off the screen if using a 120 degree motor. I suspect they use the 110 degree motors (maybe less) in the 3 wiper systems, but not sure.