1157s are the stock, 2057s are the same bulb but with a heavier filiment used mostly for trailers due to vibration. Now, I run a 2357 out back. The 2357 is 3 or 5 watts brighter then the 11s or the 20.
Where does one find this 2357 bulb? Wallymart or does it have to be a trucking facility or auto parts store?