I got my 1/2" Factory UTV three piece skid set installed before coming to the Lost River, Rally in the Pines.
I did mount the main skid using the OEM screws. Then used the domed washer and a center punch to located the new bolt holes. Drilled at 3/16ths then 3/8ths and installed the rivit nuts. Worked just great. Then went back and took out the OEM bolts, installed Rivit Nuts and good to go!
I didn't get the "extension plate" with mine. So while one was being shipped to me, I designed my own and cut on the PlasmaCam. Installed Rivit Nuts in the plate and installed.
One issue, the front diff skid. Positioned with the tongue & groove matched up correctly. Then held in place with a clamp. Drilled the two rear holes and installed Rivit Nuts and bolts. THEN used a heavier clamp to bow the skid over the front diff bolts and the frame piece that projects down. With the skid bowed I was able to install the front bolts perpendicular to the frame. Looks great!!
On the rally rides, some rocks, and never heard the skid hit. The General really does have great ground clearance!!!
Pirate