The Filling Station in Lebanon, OR. has the tail lamp assemblies, part numbers BA-25, Ba-26 or TR-64, TR-65. These would be dual element assemblies:
one element each for tail/parking and the other for brakes. Your turn signal switch should have an interrupter for the brake lights that allows the brake lights to be used for turn lights as well; otherwise use the light above the tail lights for the turn lights.
