I can vouch for roadstercycle. The series R/Rs he sells are top notch. Cured all the electronic ills on my Buell 1125R. On this bike the R/R (a Ducati part) was located behind the motor under the seat. On these twins that's one very hot environment. Removed stock and mounted the new one behind the license plate. Haven't had a problem since and runs at 14.1v all day long.