Craig,
I have not tried it, but if you search around some of these larger LED tail light manufactorers, you can find several products that will fit into the existing bulb sockets and broadcast an L.E.D. light.
The switchover should not be difficult, they also sell flexible L.E.D light bars, that will plug into one of the tail sockets and stretch outward.
You'll most likely have to do a google search for L.E.D tail lights - and find one of these companies and give them a call.
Brad