A member over on M3forum.net has been compiling production statistics for M3's of the various body styles based on a script that pulls data from a BMW ETK database. I asked him to pull the same data for E39 M5s, some of you may find it of interest. For me it explains why it is challenging to find an Alpine/extended caramel interior M5. Here is what he has so far (data still needs some vetting):
He posted it to bimmerforums, I do not believe he is a member of this site currently.

Individual paint (SONDERLACKIERUNG):
- BZ94005__N/A protected data________WALK NAPPA/SCHWARZ (M1SW)
- BZ96311__DAKAR YELLOW II___________PRAEGELEDER/SCHWARZ (O6SW)
- BZ97659__DAKAR YELLOW II___________PRAEGELEDER/SILVERSTONE/EXTENDED (O5SS)
- BZ97861__BIARRITZBLAU-METALLIC_____WALK NAPPA/SCHWARZ (M1SW)
- BZ98180__STEEL BLUE-METALLIC_______PRAEGELEDER/SILVERSTONE/EXTENDED (O5SS)
- BZ98279__STEEL BLUE-METALLIC_______WALK NAPPA/SCHWARZ (M1SW)
- BZ98412__DAKAR YELLOW II___________PRAEGELEDER/SCHWARZ/EXTENDED (O5SW)
- BZ98415__ORIENTBLUE-METALLIC_______PRAEGELEDER/SILVERSTONE/EXTENDED (O5SS)
- BZ98419__STEEL GREY-METALLIC_______PRAEGELEDER/SCHWARZ/EXTENDED (O5SW)
- BZ98529__TECHNO-VIOLETT-METALLIC___WALK NAPPA/CARAMEL (M1CR)
- BZ98670__COSMOSSCHWARZ-METALLIC____PRAEGELEDER/SILVERSTONE/EXTENDED (O5SS)
- BZ98671__NIGHT BLUE-METALLIC_______PRAEGELEDER/SCHWARZ/EXTENDED (O5SW)
- BZ98674__NIGHT BLUE-METALLIC_______WALK NAPPA/SCHWARZ (M1SW)
- BZ98782__VELVETBLUE-METALLIC_______PRAEGELEDER/SILVERSTONE/EXTENDED (O5SS)
- BZ98810__STRATUS GREY-METALLIC_____WALK NAPPA/SCHWARZ (M1SW)
- BZ98969__STRATUS GREY-METALLIC_____WALK NAPPA/SCHWARZ (M1SW)
- BZ99217__VELVETBLUE-METALLIC_______LEDER M TEXTUR/ANTHRAZIT (F2AT)
- BZ99231__DAKAR YELLOW II___________WALK NAPPA/SCHWARZ (M1SW)
- CF90428__ORIENTBLUE-METALLIC_______WALK NAPPA/CARAMEL (M1CR)
- CF90794__ELECTRIC RED______________WALK NAPPA/CARAMEL (M1CR)
- CF90963__ELECTRIC RED______________WALK NAPPA/CARAMEL (M1CR)
- CF91261__NIGHT BLUE-METALLIC_______PRAEGELEDER/SILVERSTONE/EXTENDED (O5SS)
- CF91316__TOLEDO BLUE-METALLIC______PRAEGELEDER/SILVERSTONE/EXTENDED (O5SS)
- CF91463__DAKAR YELLOW II___________PRAEGELEDER/SCHWARZ/EXTENDED (O5SW)
- CF91526__NIGHT BLUE-METALLIC_______WALK NAPPA/CARAMEL (M1CR)
- CF91655__STEEL GREY-METALLIC_______PRAEGELEDER/IMOLAROT/EXTENDED (O5IM)
- CF91688__STEEL GREY-METALLIC_______WALK NAPPA/SCHWARZ (M1SW)
- CF91805__ESTORILBLAU-METALLIC______PRAEGELEDER/SILVERSTONE/EXTENDED (O5SS)
- CF91982__TITANIUM GREY-METALLIC____WALK NAPPA/CARAMEL (M1CR)
- CF92325__STEEL GREY-METALLIC_______PRAEGELEDER/SCHWARZ/EXTENDED (O5SW)
- CF92373__STEEL GREY-METALLIC_______PRAEGELEDER/SCHWARZ/EXTENDED (O5SW)
- CF92669__ELECTRIC RED______________PRAEGELEDER/IMOLAROT/EXTENDED (O5IM)
- CF92671__SEPIA-METALLIC____________PRAEGELEDER/SCHWARZ/EXTENDED (O5SW)
- CF92923__TITANIUM GREY-METALLIC____WALK NAPPA/SCHWARZ (M1SW)
- CF92934__NIGHT BLUE-METALLIC_______PRAEGELEDER/SCHWARZ/EXTENDED (O5SW)
- CF92962__BLACK SAPPHIRE-METALLIC___WALK NAPPA/CARAMEL (M1CR)
- CF93113__VELVETBLUE-METALLIC_______PRAEGELEDER/SCHWARZ/EXTENDED (O5SW)
- CF93154__TITANIUM GREY-METALLIC____PRAEGELEDER/SCHWARZ/EXTENDED (O5SW)
- CF93749__SCARAB GREEN-METALLIC_____PRAEGELEDER/SCHWARZ/EXTENDED (O5SW)
- CF93968__PETROL MICA-METALLIC______PRAEGELEDER/SCHWARZ/EXTENDED (O5SW)
- CF93990__TITANIUM GREY-METALLIC____WALK NAPPA/SCHWARZ (M1SW)
- CF93991__ELECTRIC RED______________PRAEGELEDER/IMOLAROT/EXTENDED (O5IM)
Individual interior (SONDERPOLSTERUNG):
Individual paint & interior (SS!):
- BZ96885__ROYALROT METALLIC (390)_______SONDERPOLSTERUNG (Z1XX) Champagne interior, black carpets
- CF90370__LE-MANS-BLAU METALLIC (381)___SONDERPOLSTERUNG (Z1XX) Full black nappa w/ Le-Mans blue seat inserts. Door panel cards in Estoril Blue.
- CF91266__SCHWARZ 2 (668)_______________SONDERPOLSTERUNG (Z1XX) Light Beige seats, remaining interior as extended black nappa.
- CF91851__LE-MANS-BLAU METALLIC (381)___SONDERPOLSTERUNG (Z1XX) Champagne interior, black carpets.
- CF91897__SCHWARZ 2 (668)_______________SONDERPOLSTERUNG (Z1XX) Wood trim birch anthrazit,extended Petrol leather nappa, multi colored steering wheel, and chrome interior package.
- CF92286__CARBONSCHWARZ METALLIC (416)__SONDERPOLSTERUNG (Z1XX) Champagne interior, black carpet, chrome interior package, muliti colored steering wheel, and wood trim natural poplar.
- BZ99307__SEPIA-METALLIC________SONDERPOLSTERUNG (Z1XX) Wood trim birch anthrazit, multi color leather steering wheel.
- CF92149__SEPIA-METALLIC________SONDERPOLSTERUNG (Z1XX) Wood trim birch anthrazit, multi color leather steering wheel. Presentation vehicle "Motorshow MONTREAL/TORONTO/VANCOUVER"
- CF92303__SEPIA-METALLIC________SONDERPOLSTERUNG (Z1XX) Wood trim birch anthrazit, multi color leather steering wheel.
- CF92359__PETROL MICA-METALLIC__SONDERPOLSTERUNG (Z1XX) Champagne interior, black carpets.
He posted it to bimmerforums, I do not believe he is a member of this site currently.