While in free roam I saw a Regina that had the roof rack but no luggage.
I'll try to figure out the code tomorrow.
I briefly looked at the Unmarked Cruiser.
bodystyle 255 and 253 give it the Pushbar and the Siren? (I don't know what that is called, it's the two things at the bottom of the windshield)
bodystyle 254 and 0 remove the Pushbar and other thing mentioned above