No idea, but I do know that Whelen’s European division has their own demo vehicle, a Ford Ranger:
They also once had this Crown Victoria (which as you can see has a FastTrax &…Liberty?, fitted (thought it was an Edge but now that I look at it it seems too thin/short to be an Edge):
Something I found out just now is that this particular Whelen demo vehicle apparently went on to be used in actual law enforcement service going by this photo (with relatively minimal changes too!):
