Wow! Deal Extreme has a bunch of car replacement LED lamps..
I buy stuff from them once in a while. Some of it's good, and some
of it has to be modified-on-arrival..
The only problem I see with replacing a burned out tail light with LED, is the long shipping time.
But, once you change out those old incandescent lamps, you won't have to worry about them anymore.
(In theory anyways).