I know there was a group buy for the Shindengen voltage regulators, but I didn't buy one then.    Now I see that the Shindengen is a series voltage regulator, not a shunt regulator like the original.   This means that the stator will be cooler because full current won't always be flowing, and should last longer.    Does anybody know a good place to buy one??   
             http://roadstercycle.com/images/Shinde1.jpg