Ren,
Your VIN calls for the 99b-3209 for the front and the 8805-1022 for the rear. Here are the links for those shocks.
Paulette,
Koni is for sure the best riding shock, they are a hydraulic shock designed for heavy applications. However you would be using the FSD series for your coach. The 99 series are designed mostly for independent front suspension diesel coaches with very few exceptions being a couple use a straight axle. Here are the links for the shocks your chassis would require.