that would be awesome , i wanna do it too , but don't know where and How !!
Yes LED is 20X More life time , Less heat Generation and way less battery Consumption , on the long Run it maybe Saving you some Gas as Well ! Plus that it's less annoying to the opposite Drivers ,
But i Believe you need to Change the whole Set , Socket and wiring too , it's gonna cost Ya , Keep me Updated if you Find Any thing !