Good Spot - but as usual one answer leads to more questions.

I am looking to upgrade my Range Rover, but on the GROM website it says it's compatible with Range Rover with Alpine Stereo. I dont have an alpine unit, it's all BMW. So i look at the BMW ones and they dont work with DSP, which i have, so is my only option to get a newish BM54 unit and MP3 CD Changer