I bought those grey factory grips from Midway when I won my 3913 LS on GB.
The orig factory grips that came on the gun were perfect so I didn't put them on.
If you haven't found any locally after we get the all clear to resume normal activity I'll sell you the one I have for cost + shipping.
Glad you found a set, though no doubt they cost a bit more than the usual $20. I for one am bummed that S&W stopped making these gray grips, lucky that a had a set or two in the parts bin when they got discontinued (though mine are not for sale).