I don't know if this will help you all that much, but there's a 1988 New Mexico SSP listed in our VIN Project...
http://www.specialservicemustang.net...info220245.htm
...which is part of a 10 car batch of consecutive VINs. Your '90 is the second New Mexico SSP to have surfaced. 
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Bill Jr.
To everyone out there, wherever you are. Remember, the light at the end of the tunnel may be the police chasing you down in their own Mustang!
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