[Reaper1a]

I agree, check with your department and local laws first. That being said, there are guys on here who have set up their vehicles with emergency lights (some being cops, some being roadside workers) and they have all looked very professional from what I've seen. Whelen is definitely your best resource, and their customer service should be able to help you out with what will fit. A lot of it will depend on what you are able to spend on the setup.