LaRosa Harley Sportster to Bobber Style Solo Seat Conversion Mount Coil Spring Kit (Fits: 2010 - 2012) Fits Harley-Davidson Sportsters from 2004 to 2017 Black Powder Coated Finish Comes with a pair of coiled springs This kit will help converts your Harley Sportster to be able to mount Chopper Bobber Style Solo Seats. Please note this mounting kit will not work with Sportsters with ECM module under the stock seat.