The Lindberg kit is of a 1996 model. On policecarmodels.com, the Welly is a nice kit, and is of the 2000-up year model. I have ordered light bars, and other stuff and have not been dissapointed yet.
Welly has one in a plain white white wrapper you can do many things with. I got mine when Testors was marketing them under thier name, and I made mine a Denver traffic car. It came with 3 different lightbars, the Whelen Edge Strobe, the jetsonic, and the 7-pod Vector.