ChrisL sent me an email with some pictures he received of a 1985 CHP Mustang. The car turned up after he placed some ads on Craigslist in search of Nevada SSP Mustangs. We already had this car confirmed through the Ford Special Equipment Parts List for this DSO, but now the car has even more documentation:
http://www.specialservicemustang.net...info234831.htm
The VIN for CHP #E408315 is one digit off from this SSP. Thanks again, Chris!