I will update the page for your SSP in our VIN Project...
http://www.specialservicemustang.net...info176501.htm
...but for now I have attached a current screenshot of your car's page in our VIN Project. I have no recollection of the source for the photos used in page, but the car was clearly a restored with a lightbar. Below is a link to a photo section of what appears to be the same car -
LINK
So was your car at one time marked as perm #1279 with 505 on the roof? I won't use those photos if it is the same car. Brad, if you have any current exterior photos, please post them up or send them to me. I'd like to nicely document your GSP, since it is the only aero-slicktop GSP found yet.