Required when replacing the stock dual halogen headlamps with a LED headlamp or any other H4 based headlamp.

2014-2022 fits H-D FLHR Road King
2017-2023 fits H-D FLHRXS Road King Special
2019-2022 fits H-D FLHT Electra Glide Standard
2014-2019 fits H-D FLHTCU Electra Glide Ultra Classic
2015-2016 fits H-D FLHTCUL Electra Glide Ultra Classic Low
2014-2023 fits H-D FLHTCUTG Tri Glide Ultra
2014 fits H-D FLHTK Electra Glide Ultra Limited
2015-2023 fits H-D FLHTK Ultra Limited
2015-2019 fits H-D FLHTKL Ultra Limited Low
2014-2023 fits H-D FLHX Street Glide
2014-2023 fits H-D FLHXS Street Glide Special
2015-2023 fits H-D FLRT Freewheeler