Digitron - the instructions you are reading are for the BMW factory wiring harness. That is what is going to cost you $199. However, it appears you are looking to go the aftermarket route which many people will advise you not to do. I DO have an aftermarket harness that has worked very well for me. I bought it at Advance Auto and it has both a 7-pin round connection and a 4-pin flat connection. All the wires are spliced into the factory wiring going to the taillights. This wiring harness is about $20-30.

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2001 X5 3.0i (PP/WP/AP) Traded at 213K miles
RARE White on Black - Why does everyone get Tan??
First E53 with 215s on XOutpost!!