Welcome...here's a link to some in-service pics in the gallery of this website.
http://www.specialservicemustang.net/Gallery/MISS.htm
Those were pretty rare and I can't recall if we've had anyone turn up with one here. Seems to me I recall either here or on .org someone turning up with one that wasn't very original anymore but I can't remember for sure. Maybe another member will chime in to confirm or deny that recollection.
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Mike
1992 Michigan State Police SSP Mustang #5114
1993 Wisconsin State Patrol SSP Mustang
1993 Missouri State Highway Patrol SSP Mustang P641
http://members.fotki.com/MOstang/