Up for sale is FEULING 2005-2014 FXDC Dyna Super Glide Custom Harley Davidson HYDRAULIC LIFTERS RACE SERIES. The vendor part number is 4051. 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.