As far as I know, that's not correct. No /5 models were shipped with the needle bearing rockers. The needle bearing rockers were introduced with the /6s. In fact some early /6s, only R60 and R75 models it seems, were still shipped with the bushed rockers and not the needle bearing ones as the factory had to consume its remaining stock of the bushed rockers. It seems the factory acknowledged their inferiority as during the transition between the two types they only installed the bushed rockers on R60/6 and R75/6 models and put nothing but the newer, better needle bearing rockers on their flagship R90/6 and R90S models.