^Negative terminal is extremely easy... and as inexpensive as you want it to be. I've used 0 AWG or 4 AWG stereo wire with a good battery terminal and ring terminal on each end in a pinch. Since I used to do stereo installs the cost was $0. A used OEM one on Ebay is also an option...

FYI OEM part number is: 61116919976 and is $28 at ECS. I'd probably go that route on the X5 were I to be in your shoes.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)