if u have no leather, its not a GS or SE.
what kinda wheels do you have? not that it matters much because most likely you have an LS and it shouldve come with 14" hubcaps, but if you have 15" alloys then hey, thats even better. but with sunroof, painted moldings (it is a 97), no leather, DC4 chassis code, you have an LS. oh yeah, if you had an automatic tranny, then right off the bat you can rule out GSR