welcome ! :xoutpost:

Its possible. You can buy them from your BMW parts counter at your local dealership. Or you could try e-bay...

However, the navigation conversion is quite something because,

1. Its labor intensive. You'll be tearing out seats, the carpet, etc... to replace the wiring harness with the new nav wire harness.

2. Its costly. OEM parts are expensive...

So, if you have the money and the time, I guess you could give it a shot.

Otherwise, you might just be better off with a 3rd party navigation system...