I also have a 669 and from what I've learned, in short, no. The 6906 has a completely different mounting system. You pretty much have 3 choices for grips that I've found- the early original grips with a pebble type texture, the later original grips which are the checkered hard plastic, and some hard rubber grips from uncle mikes. I have the later originals and the uncle mikes. I put my originals back on because I thought the uncle mikes made it too fat. I may try to thin them out and hand simple them at a later time though.