Those seem to be quite rare. If you're willing to wait it out you can find the proverbial SSP needle in the haystack. My 1989 Minnesota State Patrol SSP is a 1 of 20 purchased by that state and seems to be the only one that has surfaced in the SSP enthusiast community thus far. You can always do what I did...obtain SSP from another agency to enjoy and ward off the challenge of waiting to find one and then just add the Indiana one as a 2nd SSP when it turns up
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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/