You should then find code 782 in the options list, which looks as follows on your vehicle (no 782 on this car from the factory):
Type code HC91
Type M5 (EUR)
Dev. series E34 ()
Line 5
Body type LIM
Steering LL
Door count 4
Engine S38
Cubical capacity 3.80
Power 255
Transmision HECK
Gearbox MECH
Colour SCHWARZ 2 (668)
Upholstery CHAMPAGNER KOMPLETTLEDER (0321)
Prod. date 1991-07-24
Order options
No. Description
240 LEATHER STEERING WHEEL
302 ALARM SYSTEM
325 REAR SPOILER
401 SLIDING/VENT ROOF, ELECTRIC
416 SUNBLINDS
423 FLOOR MATS, VELOUR
459 SEAT ADJUSTM., ELECTR. W. MEMORY
494 SEAT HEATING F DRIVER/FRONT PASSENGER
496 SEAT HEATING FOR REAR SEATS
499 HEADRESTS IN REAR, ELECTRIC. ADJUSTABLE
528 AUTOMATIC AIR RECIRCULATION CONTROL(AUC)
534 AUTOMATIC AIR CONDITIONING
662 BMW BAVARIA C PROFESSIONAL RDS
671 CD 10 Selektion
676 HIFI LOUDSPEAKER SYSTEM
690 CASSETTE HOLDER
781 LM Rad 9Jx17 auf Hinterachse
906 SOKO FOTOWAGEN OHNE ANTENNENBO
940 SPECIAL REQUEST EQUIPMENT
Complete leather (Komplettleder) is very rare, only 74 3.8s were built with that.
You can see what combinations that were available and how many built och each (scroll down a bit):
www.e34m5.se
The Nuerburgring-package was an option for the 3.8s from 92-94 and standard on the 1995s. Although the package did not include servotronic on the 1995.
Some people add the EDC-switch from the Nuerburgring-package on their non Nuerburgring cars. The package also contained a thicker rear stabilisator and 9x17 wheels, standard on the touring model, also available as a separate option for the saloon cars, as on your car (781).