The now defunct Odyssey Automotive Specialty Vehicles often used Whelen Traffic Advisor housings cut down to 4 heads in the grill. Since these housing took 52/500 "slide in style" heads any combo of halogen or strobe was possible. They were remotely powered, usually incorporated with the rest of the system on that vehicle. I know they were made in-house by Odyssey, but I don't know how they ordered from Whelen. They May have had enough volume that they just ordered the 8 head housings or they may have ordered the housings already cut. What I do know is these were specific to that vehicle upfitting company.Whelen offered six and eight head versions of the oval style traffic advisor which was a metal housing, and they offered one, two, and three head versions of the oval housing dashmiser, which was sometimes a plastic housing depending on certain variables and time frames.
Whether or not to his example should be considered " factory" or not is less interesting and important to me than the fact that it represents an interesting application from a specific manufacturer of vehicle. I really liked the idea of using the oval housing on a push bumper, I thought it cleaned up the install very nicely. I have since used dominators on push bars to the same sort of effect and been very happy with the look.