Working police sirens and new police light type

Maybe the sirens on the modern cars (grand marshal, fire first responder etc...) And then on the old Burnside they could use the old sterling siren. Now that might not be possible, so they could add another type of police car for burnside.
Maybe they could add this police light type?
http://www.statetrooperplates.com/images/Arkansas/ARSP100.jpg

or...

http://www.classicautorental.com/servicevehicles/K54-ShPolice_zm.jpg

Those would look amazing!