Just be careful when securing the bars- 1Rs are notorious for slipping (which I can attest to).
If the current bars are close enough in width/angle, I'd leave them where they are. Otherwise, tighten new bars firmly, but careful with the bolt obv. I've also seen one with a cracked/glued internal wedge, which didn't work out!
I was advised on a thin layer of grease to help with the grip, which seemed to do the trick.