I'm a retired sheriff's deputy, and I currently own a '98 black B4C Camaro with 23,000 actual miles (it was never put into agency service). I previously owned an '01 white B4C.
My old friend Keith Kleis was the Code 3 rep in the Great Lakes area for many years, and even though he is retired he may have some parts lying around. If not, he can probably direct you to someone. His email is: mpss@sbcglobal.net