http://www.gnttype.org/numbers/rpo.html
the gn was standard with LC2 3.8turbo , 2004r, 8.5" rear with 3.42 gears, A/C , blk /gray bucket console interior , black exterior, ps , power master brake system
posi was optional except on GNs built after sept 1987,
common options are power window , doorlocks tilt ,cruise , rear defog, power driver seat , deck release , ttops, visor lamp, dome reading lamp, power antenna ,equalizer stereo cassette, concert sound , body side mlds
not so common options ... astro roof , security , twilight sentinel , trunk kit
being options they could build a GN without them