KiWAV Oil dipstick with skull cap for Harley Davidson 3-3/4 inches Unique design for a better look. Simple and easy to install Replacement for OEM dipstick Plastic dipstick has all required markings Do not work for screw-in type oil fill tube. This oil dipstick fits 1-7/16" (1.44"/ 36.7mm ) inner diameter oil fill tube, please measure it before purchasing.