Taillights are another area that can use some visibility improvement. Modern LED conversion kits are now available that allow you to use your stock taillight housings with LED inserts. LED lamps are brighter than the incandescent bulb, generate no heat, and require less current to operate. Here's an LED taillight kit for a '69 Mustang from the Mustang Project. The upgrade is at least twice as bright as a conventional setup. The kit is now being offered at a price of $99.95.