John, I checked the folder for that SSP in our VIN Project, and the files are all dated 5/27/2013. So I went back and looked through our classifieds section to see if there were any 1988 GSP Mustangs listed for sale around the same time. Sure enough, the following thread was posted at about the same time:
http://www.specialservicemustang.net...ead.php?t=5012
I'm not 100% sure that the above thread is for VIN ending in JF225731, but the odds are pretty likely in my opinion. Hope that helps...