Superflux LEDs come stock on high end cars such as BMW, Cadillac, and Mercedes. They are certainly not cheap. A single LED can cost as much as $1.00, which can add up fast. I used 24 LEDs (each side) for the taillights and 4 (each side) for the sidemarkers. I handmade the circuitboards for both. The ones for the sidemarkers are so tiny! The circuitboards are much bigger than the hole meant for the bulb to go through. So to get the new LED circuitboards in, I had to cut out the turn signal area from the back of the taillights and sidemarkers, then put them back together.
Original installation June 2011