bluetooth module part numbers 

84 21 6 915 563 end of life 10/02
84 10 6 931 854 end of life 03/03
84 21 6 934 552 end of life 06/03 1st generation
84 21 6 938 610 end of life 10/03 2nd generation
84 21 6 934 961 end of life 03/04 3rd generation, VR availeable with coding
84 21 6 950 089 end of life 06/04 4th generation, better DSP onwards
84 21 6 945 387 end of life 01/05 5th generation, better antenna optimization
84 21 6 955 522 end of life 10/05 6th generation, Phonebook works with iphone.
84 10 6 969 268 end of life 04/06 7th generation
84 21 6 958 358 end of life 05/06 8th generation
84 10 6 987 546 end of life 9/06 9th generation
84 10 6 980 130 end of life 11/06 10th generation
84 10 9 133 329 end of life 1/07 11th generation
84 10 9 145 007 end of life 05/07 12th generation
84 10 9 154 358 current production 13th generation

credit to forum member john [ccfj1]