Harley Davidson FLD 1690 2012-2013. Harley Davidson FLD 1690 ABS 2012-2016. Allows the use of exhaust systems with 18 mm O2 sensor bungs to be used with late model bikes with 12 mm O2 sensors. Reduces the 18 mm O2 bungs to 12 mm O2 bungs found on select '10-'15 models.
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