You'll need a set of these thinned bushings and shortened screws (4 of each) to install slim grips on your 1911. This set is stainless steel and includes allen wrench. Fits Gov't Model, Commander, Compacts and EMP.
O-rings for use between the grips and screws
HD-300-S-TS Slim Carry Groove grips for full size 1911 frames