OKAY Still planning for my retro-fit here and hit a bump..

while looking on real oem it seems that I already have the BMW BM53 Radio module Part number 65 12 6 988 276

Could I be wrong? It is a 2002 4.6is X5 with DSP; subwoofer & cd changer. I'm hoping that I can get away with only buying the widescreen & navigation computer.

Why can't it be this easy!