1959 Cadillac Red LED Tail Light Inserts with Red Lenses. How about this pair of tail light inserts for your favorite Cadillac? They feature 40 RED 12 volt super fast LEDs. They use epoxy coated fully sealed circuit boards. They are 5 1/2" long x 2 7/8" OD. This listing is for 2 lights as shown. We also stock the clear version and new chrome bezels.