I think the only motors that will fit are ones that came on Alfas whose wiper arms move 180 degrees out of phase - that is, like a bird flapping its wings. Basically, just the 105 cars from the 1960's. The shape of the frame that the motor mounts to requires the motor's armature to be at a non-right angle from the output shaft of the transmission. See photo below.
Later Alfas - the cars whose wiper blades move in phase - have a different frame that accommmodates a motor whose armature is 90 degrees to the output shaft. People have reported installing Bosch wiper motors from other European cars (like BMW's) on these cars, but I don't think they'll fit the early cars like your '69.