Now your thinking.Stock rods have wat 1 inch gap i think?Aftermarket 11/2 maybie!Thats the differance except you can close it up when you want for less transfer?Move the top washer thats welded on your rods up for a 2 inch gap and add those white shims for desired transfer gap or use a few of those washers that you will need when you cut off the two you are moving.Saves money and wieght.