The grey barrel pattern is correct for late 1950s. The originals on this bike were grey barrels, and I replaced them with the grey "R" grips from eBay that you link to. The quality is dodgy. I ordered two pairs and took the best two.
The originals were thicker and better rubber. They had more cushion as well. But that grey "R" is the closest reproduction of the grey barrel made today that I could find. There are much better reproduction grips available today if you are willing to get away from the grey barrel type, but I wanted to go with an original look. After these wear out, I'm replacing with something higher quality. The reproductions are not terrible, but really are pretty cheaply made.