Please keep the grips with the gun, don't sell them. Harder and harder to find old guns with original grips on them. You can store them if you want, but if you sell the gun, please put the original grips back on it, don't be a profiteer.
I know of two cases where a S&W revolver with hard-rubber grips that were absolutely mint, was accidentally dropped on a hard floor. After that the stocks were no longer intact on one side.
Those on the revolver that's the subject of this thread are apparently cracked (hopefully only on one side), and once cracked a complete split is much more likely.
For that reason on those guns which I still use, and still have original hard-rubber grips, have had them replaced. If or when the gun is retired the stored stocks will go back on. Otherwise they are stored with the arm they go to.
Numrich/Gun Parts Corp. are currently offering both checkered wood, as well as exact duplicate of the black hard-rubber kind for K-frame Smith's - but made from modern plastic. I consider them to be an excellent solution for those guns still in service.