![](http://sdough.smugmug.com/photos/298236720_W6Akk-M.jpg)
I hate fitting grips. My gunsmith has retired from the "grip fitting". Here is my GW2 with the Buffalo Bros that I fitted to it.
If they are going to be one piece, with the spacer in the middle, follow their instructions on fitting the spacer.
When you are fitting to size, put the grips on and look at the high spots, Ink them if possible and remove and do the heavy sanding (the heavier grit you use, will mean more clean up sanding at the end.) Sand slowly and check for fit OFTEN. You can take it off but ya cant put it back on. When it is getting close, (this is how I do it, there may be better ways, but this is my way.)
Put painters tape on the b/s and t/g where you are going to be sanding. Again go slow, and use a finer grit here, and make sure you don't sand thru the tape, and ruin the finish.
I didn't need any "final sanding" on these grips but what I use for making them real shiny is SemiChrome Polish (it has jewelers rouge in it and will give a good shine to almost anything.
Camille said it and I can't repeat it enough GO SLOW, TAKE YOUR TIME. BB's grips are pretty close, and only took me 1/2 hour to do these in the picture.
good luck and let us see a finished product...
curley