Here is Don's 2012 FL with our bolt on front end. 23" fat boy wheels, lowered 1" and our bolt on bagger trees. He was running this set up with the stock front end and crashed his fender into his lower tree. Our trees still give you 3" of travel even with the 1" lowering kit. And yes, it works with your engine guard... True bolt on, any rear tire size with or with out being lowered will work and ride wobble free without cutting your neck!