I need some LED bulbs (#921) for my third brake light. I need all (3); the outer bulbs for lighting up the bed, and the middle bulb for stopping. The outer bulbs must be white. Can the middle bulb be white as well? I was looking on Amazon and EBAY. The prices are all over the place and most only come in a (2) pack or multi pack. I don't want to break the bank on price, but do want something that won't burn out in a week or less.