Just use a BFH and flatten the ribs inside the OEM skids and you don't need to use any spacers. Or, you can cut a channel out of the ribs where the diff drop pucks are. These are the 2 techniques used back in the day so you didn't lose any ground clearance. I used the BFH method. I'm a proponent of the diff drop just to keep the outer boot bellows from touching.
Hope this helps.
Hope this helps.