I'm planning on investing in a pair of Hella 4000's for my ARB since it sounds like I can fit them with the use of a few washers. After doing some research, I still have a couple of questions. Do absolutely need to purchase the $40 - $50 wiring harness for these or is there another way to wire them in? Also, between the eurobeam and fog pattern, what would be a better choice? Thanks for your input.