Tata Hexa is available in 5 different colours - Tungsten Silver, Pearl White, Sky Grey, Urban Bronze, Arizona Blue. For the availability, we would suggest you walk into the nearest dealership as they will be the better person to assist you because it depends on their stock book - Car Showrooms
For the availability of spare parts, we would suggest you walk into the nearest service centres. You can click on the following link to see the details of the nearest service centres and selecting your city accordingly - Service centre. Moreover, for an idea of the prices of the spare parts, you may follow the below link - Spare Parts.