Hi Dave, and welcome to the HDTimeline forum. While others will weight in shortly, the factory alarm/siren difference between early version and new version iissue on compatibility to the button fob system verses the buttonless fob system (w/ auto arming and compatibility to new pager option). In the 2010 Parts and Accessory catalog is a chart that shows two distinct groups of part numbers, which explains what will cross or not. I think it would work, but I would check with the HD dealer to be sure as many dealers install the immobilizer portion of the factory alarm system as a matter of course on your newer bike, so all that would be required is plug and play to see if it would work.