I have a 2000 E320 4 Matic. A few years ago I purchased a Direct OEM CD player from germany for my car. Plugs right into the original plugs. Up to a month ago my battery went dead and I could not locate my radio code. Since this is not the original radio the dealer could not help me, nor could they help me with the radio serial numbers. Does anyone know how I can obtail this radio code. I will provide bill of sale from paypal for radio purchased from germany as there is no confusion that this could be a stolen unit.

Any help would be appreciated
Thank you Ted