The wild one site does give recommendation on +2 or +4 etc... But I'm wondering the best way to do a search. I get limited responses when I put in the oem part number and the +2. I was hoping there might be a site that would help me figure out an oem+2 part number or for those with experience replacing them, you might could tell me part numbers. I'm totally fine buying them from somewhere other than Harley. Thanks guys-

 

Yes you can mount wo508's without changing cables, but I did lengthen my wires a few inches just for a little more slack for going inside the bars.....here's a pic of my 2003. It would look a lot better with braided lines but that's next....hope this helps oh...you should release the throttle cables from the clamp at the head of the frame, you'll need the slack . I have 518's on now but I have changed the brake line but the rest stayed the same

 

I put 508's on my 2007 and used the original wires, throttle cables and brake lines. The wires were a pain to get back together but it worked. I had to assemble the throttle cables on the bars.