Here's some exerpts from the 1988 accessory catalogue from SAAB.
All prices listed are from the 1988 catalogue and are in Swedish currency.
These products might not be avaible through the resellers any more, and the prices won't be the same.

Styling

SAAB Airflow Saab 900 2d,3d M87- with integrated bumper 116 007 709, 4070:- sek Side shields 116 007 907, 3485:- sek Wheel arches 116 007 808, 1285:- sek Extra head lights 207 401 001, 590:- sek Fog lights 207 400 003, 590:- sek	SAAB Airflow Saab 900 2d,3d -M86 116 007 105, 5120:- sek Saab 900 4d,5d -M86 116 007 106, 5325:- sek Extra head lights 207 401 001, 590:- sek Fog lights 207 400 003, 590:- sek Light mount kit 116 004 029, 158:-
Rear windows Jalusie Saab 900 2d,4d 105 114 128, 560:- sek Saab 900 3d,5d 105 114 151, 515:- sek	Rear spoiler "whale tail" Saab 900 3d,5d 116 004 508, 2500:- sek
Mud flaps, rear Saab 900 3d,5d M87- with integrated bumpers (10)69 39 375, 295:- sek Saab 900 2d,4d M87- with integrated bumpers (10)69 39 383, 296:- sek Saab 900 -M86 (10)78 74 340, 208:- sek	Wheel arches complete set Saab 900 M87-  with integrated bumpers 116 004 607, 980:- sek Saab 900 Aero M87-  with integrated bumpers 116 004 706, 980:- sek Saab 900 M84-86  without integrated bumpers 116 004 805, 980:- sek Saab 900 Aero M84-86  without integrated bumpers 116 004 904, 980:- sek
Rear spoiler M85- Saab 900  (10)78 73 797, 2d, 935:- sek (10)78 74 381, 4d, 945:- sek	Rear spoiler  Saab 900 3d,5d (10)78 73 789, 1380:- sek
Rear panel  Saab 900 3d,5d Red plastic 105 219 802, 595:- sek Saab 900 2d,4d 105 219 703, 620:- sek	Vent covers complete set Saab 900 3d,5d 116 006 008, 208:- sek

Rims

Alloy rim "Turbo"  Saab 900 M88- 6"*15" 105 122 907, 1035:- sek Saab 900 M88- 5.5"*15" 105 123 301, 1040:- sek Saab 900 M81-87 5.5"*15" 105 122 808, 1035:- sek Lid 105 123 400, 83:- sek	Alloy rim "Cross-Spoke"  Saab 900 M88- 6.5"*16" 105 122 337, 1350:- sek Lockable lid, complete set 105 122 311, 1495:- sek Must be mounted with sport chassie 138 002 001 and Wheel arches
Alloy rim "Super Inca"  Saab 900 M88- 6"*15" 105 121 909, 1080:- sek Saab 900 M81-87 6"*15" 105 122 204, 1080:- sek Lid  plastic, 105 121 305, 55:- sek Lockable, 105 121 404, 100:- sek	Alloy rim "US Turbo"  Saab 900 M81-87 5.5"*15" 105 120 604, 1080:- sek Lid 105 120 802, 44:- sek
Alloy rim "Aero"  Saab 900 M88- 5.5"*15" 105 123 103, 980:- sek Saab 900 M81-87 5.5"*15" 105 121 800, 980:- sek Lid M88-, 105 121 818, 44:- sek M81-87, 105 123 400, 83:- sek	Alloy rim "Diamond Spoke"  Saab 900 M88- 6"*15" 105 122 402, 1350:- sek Lid 105 123 400, 83:- sek
Alloy rim "Silver Spoke"  Saab 900 M88- 6"*15" 105 122 709, ????:- sek Saab 900 M81-87 5.5"*15" 105 120 406, 935:- sek Centre cap 105 119 101, 37:- sek

Interior

Gauges  Saab 900  214 157 000, Volt, 302:- sek 214 158 008, Oil temp, 302:- sek 214 160 004, Oil press, 302:- sek 214 165 003, ext temp, 302:- sek	Gauge console  Saab 900 M83- Radio compartment  204 600 100, 62:- sek Middle console 204 541 007, upper, 45:- sek 204 605 059, lower, 72:- sek
Front speaker system,40W  Two-way system Saab 900  204 515 001, black, 887:- sek Saab 900 T M85- 204 519 003, bokhara, 880:- sek	Rear speaker system,100W  Soundrack, Three-way system Saab 900 3d, 5d  (15)82 40 11, greyblack, 1995:- sek

Tuning

Tuning kit  Saab 900 T16 M87- with cat and manual gearbox. tuning kit 175 hp DIN (129kw) Shall be used together with sport exhaust 137 003 307, 7035:- sek	Sports exhaust  Saab 900 T M87- 137 003 307, 2175:- sek Saab 900 T M81-86 137 003 000, 1395:- sek
Sport chassie  Saab 900 M82- 4 springs and shocks To get the best experience mount the kit together with sway bars 138 002 001, 3320:- sek	Sway bars  Saab 900 138 000 005, 1860:- sek