Thanks for posting those!
I started searching through our threads to find the attached pic, which is the best one we have of this pair of CHPs. Once I had the plate number, I was able to find this 1989 SMPV in our VIN Project -
http://www.specialservicemustang.net...info211375.htm
Notice that this 1989 SMPV does have a 1/4 panel whip, unlike the pair of SMPVs pictured above.