The info I presently have leads me to beleive that the Starfire SX was not necessarily a trim package but the bare bones model for Oldsmobile's Starfire. All 3D07 VIN# Starfire's were SX Hatchbacks but the SX does have an RPO Code of WU9 which leads me to beleive Olds did have a trim package labeled SX somewhere down the line. I'll have to keep digging!
