Up for sale is FEULING 2015-2016 FLHTKL Electra Glide Ultra Limited Low Harley Davidson HYDRAULIC LIFTERS RACE SERIES. The vendor part number is 4052. Feuling� Race Series� full travel hydraulic lifters are machined from a steel body and designed to exceed the needs of large lift camshafts and higher valve spring pressures with a slower bleed down rate.