Here is a link I found on ORG to a better picture of the VIN sticker -
http://i619.photobucket.com/albums/t...0/100_1128.jpg
The 6-digit DSO is interesting, but that doesn't necessarily mean it's an SSP - just a fleet order car, right? I'd be curious to hear how the seller documented that his 91 has factory rear disk brakes. The 93 Cobra was the first year for the 4-lug rear disk brakes (which my SSP has, albeit not 'factory-stalled'). Could this have been a test-mule from Ford?