WHEN YOU REMOVE THE BIG UGLY STOCK AIRBOX FROM THE RZ, YOU LOSE THE BATTERY HOLDER TOO, SO WE SELL THIS LITTLE LIGHTWEIGHT RUBBER INSULATED BOX TO HOLD YOUR BATTERY, USING THE STOCK RUBBER GROMMET, T-SPACER AND BOLT FROM YOUR STOCK BOX ALONG WITH AN ENGINE MOUNTED RUBBER MOUNT IT INSTALLS SECURELY