Toshi,
Your DSO matches the confirmed code for '93 CHP cars (0009). Chris N. (SparksSVT) has a '93 with the same DSO, within a few of yours on the VIN as well (111895 v/s 111908).
If you can't find where the whip was on the rear quarter, your car may have been one of the cars with the new antenna setup (roof and rear glass).
Chris has a nice Fotki with pics of his car here:
http://public.fotki.com/SparkSVT/res...n-of-chp-5305/