Nice install! I didn’t think those kits could still be had so I hatched a plan to go a different direction. I’m going to install a Bluetooth enable amp with speakers in the lower dash and under the seat on my E4. I will just stream music from my phone. A side benefit is that there is no head unit for the bad guys to get off with. I’ve found super cheap Chinese ones online that I might try (will probably sound terrible), otherwise I’ll just order something like below: