nah @cruze new parts like head lights , bumper grill , tale lights, wind screen etc are not readily available in market but can be found in Kabaria or from eBay online.
new parts which are break pads, air filter , oil filter , plugs , timing belts, bearings etc are available new from spare parts shops .
dear automatic gears are good if you want to get rid of hassle of changing gears again and again ... but I've hear that manual gears are better with CNG.
hope this will help but if you want to know any thing ells am glad to answer.