Dose not look like it as the systems are hard wired into a disco 2 so you can use the steering wheel controllers most people don't get rid of them I did try and upgrade my disco 2 lr sat nav with a newer Becker sys but could not find a bus connector
A very good aftermarket head unit with a cd stack would do if you don't want to use the wheel controlled Becker casscade is probably the best if you can find one as its singal din
