Does anyone know if there is an aftermarket blind spot available for a new X5? I thought I was getting the Drivers Assistance Plus package with the new X5 I ordered in addition to the Surround Camera & Active Drivng Assistant. The dealer ordered those 2 options but didn't include the Drivers package so I have no blind spot detector. They're wanting me to pay a ridiculous amount of money to order a new vehicle & take mine (with 800 miles) in exchange. Exploring all options before I commit to getting another vehicle.