Chris, That looks like a Mopar rocker not a T&D. The T&D's have needle bearings on the shaft mount rockers and the paired shaft ride on a 5/8" shaft with bearings as well. If you are running over 600# of spring pressure you should have the paired shaft rockers.
Just to make sure you should call T&D and ask for Sheldon he can tell you exactly what they are and when they were built just so you know.
