John - check this list against what's in your car:
XMK - roll bar painted same color as car
XMR - leather sunvisors
XAA - Aerokit
XSC - Porsche crest in headrests
XTC - leather door panels (goes w/ 981)
X97 - aluminum gear shift knob
X98 - aluminum emergency brake handle
236 - tire code (goes w/ 413)
413 - 18" turbo wheels
424 - CD storage compartment
437 - 8 way electric seat left
438 - 8 way electric seat right
454 - cruise control
490 - upgrade sound system (goes w/ 680 and 696)
502 - car made in Finland (normal for this year)
513 - lumbar support right
527 - seat memory left
551 - wind deflector between seats
584 - behind seat storage box
586 - lumbar support left
680 - digital sound system
692 - CD changer in frunk
696 - CDR-220 Becker radio
981 - leather dash and door panels
982 - leather seats, center part in draped leather
So - you have an aerokit car with pretty much a full leather interior, upgraded seats and upgraded radio system.
Sweet - lots of good options. You didn't even realize you had such a nice find, did you?
Rick
BTW - that's the same part code on your rear decklid as what I have on my aero car and my spare decklids.