I wouldn't bother trying to replace the screen. I did that, but the viewing angle is wrong. It is correct for a nav screen mounted lower on the dash like a 5 series. All the sellers advertise their screens as compatible with the e53. Technically, they are. You can install them and they work. The problem is you have to lean forward to be able to clearly see what's on the screen. So, they really aren't compatible. I haven't been able to find anyone selling screens with the correct viewing angle.

That was the final push I needed to get an aftermarket head unit. Some of the best money I've spent on my X. I installed an Avin Avant unit. It works well, ships from California and has good, responsive support. I highly recommend it.