Found the skid plate
The one pictured above is the CRD as suggested. It's available from FourStrokesOnly.com for a wallet busting $129 but I guess that's the price I'm going to have to pay to keep the rocks off.
"Gentlemen, gentlemen, be of good cheer, for they are out there and we are in here!" - Robert Culp, attributed by Hugh Hefner as the official slogan of the Playboy Mansion