Hey sorry to hear you're getting rid of the X. I just upgraded to an '03 E53 from an '01 E46. In my E46 I had an Alpine MRP-M500 which I'm planning to put into my X5. From your guide it sounds fairly straight forward, however for the past year and a half, I've been using the RCA connector inputs for my amp. I know my amp originally came with the speaker-level molex connector that looks exactly like it does in your original post, but I lost them. I've spent a day looking for these connectors but I just am not sure what they are called. Can I pick these up in Radioshack, or a similar store? Thanks for your help guys.