Black to black and color to color would be my approach. To be sure I'd check it with a ohm meter first. Be sure to post a picture when you are done. I am looking at a possible e55 myself. I just don't like the brackets and thinking about bolting the base plate to the sport rack directly like some people did on here (much cleaner looking).
I perfered the look of the case bolted to the base plate here are my results.
trunk
Originally Posted by M2Wild
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