There is a post on bimmerforums by MMMGP on 3/16/13 of a long list of interior codes
However, my VIN decoder lists my beige leather interior as 0158 but its not on his list.
My 633 was built 3.9.84 and the exterior is Bronzitbeige Metallic (139)
Interior color codes
Moderators: GRNSHRK, ron, bfons
Interior color codes
Sansouci
84 E24 633Csi Auto, Bronzit/PearlBeige 6997510
93 E32 740il M60 Auto, Alpenweis/Ultramarine
60 528i M30 5-speed Green/Beige (crushed)
71 240Z 4-speed White/Blue (rusty & sold)
65 396 Chevelle 4-speed, Marina Blue/Black (stolen)
84 E24 633Csi Auto, Bronzit/PearlBeige 6997510
93 E32 740il M60 Auto, Alpenweis/Ultramarine
60 528i M30 5-speed Green/Beige (crushed)
71 240Z 4-speed White/Blue (rusty & sold)
65 396 Chevelle 4-speed, Marina Blue/Black (stolen)