These breather bolts are a perfect addition to any custom build or upgrade

1/4" inner diameter

#BHC-828 1/4-20 x 1/2 inch Length Chrome Button Head Allen Bolt - 10 Pack

and feature a broached allen keyway at the top so you can install them into any springer that takes 1/2" fine thread

Cycle Standard spin-on oil filters are made with the finest filtering media and internal components available

#3545-3 Oil Line Nuts With Nipple For Rubber Lines OEM #3581-15 - CAD Plated Shape_Rectangle These breather bolts are aCadmium plated reproduction of Harley Davidson OEM# 3581 15 (63530 43) nuts but with a nipple to be used with 5 16 rubber lines. 9 16 24 thread. Made in Ohio, USA.