Mine looked like a Crown Victoria, but with very little "chrome".
It had painted, body color rims with small "dog dish" hubcaps, and blackwall tires.
I believe the suspension was more heavy duty.
There was a rubber mat on the floor instead of carpet.
Mine had no interior door handles in the back seat. Passengers had to wait to be let out from outside. LOL
It still had a working spotlight on the driver's side. And, there were red lights mounted on the underside of the trunk lid that would "wig wag" when the trunk lid was open. That was for added visibility if the trooper was stopped on the side of the highway at night, with the trunk lid open. There was a quick disconnect on those, so I just kept them disconnected unless I wanted to show someone how they worked.
Mine also had additional round brake lights mounted in the back window, like where the rear speakers would be. That was part of the MA State Police equipment. I don't know that all Police versions had that.
Oh, and the "ticket light". A bright reading light, mounted sort of between the sun visors.
It was repainted in a charcoal grey color, but in a couple of places where they didn't paint, you could still see the two-tone blue MA state police colors; under the trunk lid, etc.
Having been a highway vehicle, it was geared to shift at much higher RPMs. It didn't go into overdrive until about 75 mph.
Despite being a pretty utilitarian vehicle, it still had a couple of "luxury" features. Delay wipers, tilt steering wheel, velour seats. Although, I wonder if a previous owner switched those out from a civilian Crown Victoria. I always thought the Police versions in that era all had vinyl seats. But, maybe the "staties" had a little more creature comfort!
I'm sure I'm forgetting some stuff. I owned it in the late '80s. I've lost a lot of brain cells since then!
Barry