Installation notes:

Chrome plated reproduction of original style OEM# 114-36 nuts and 469-15 brass washers used on all 1936-1947 Harley-Davidson Knucklehead

the lock nut prevents the adjuster from moving

These caps also work with stock ('36 - '82) and aftermarket gas tanks with the bayonet style bung (which is up to 1982)

Here's the deal

Mini Teardrop Stealth Air Cleaner - Chrome - 2001-2017 Harley-Davidson Twin Cam Subcategory_Clutch Hardware Installation notes:The Mini Teardrop Stealth Air Cleaner maintains the iconic look of the S&S Cycle Teardrop, but is 85% smaller with a much lower profile. The increased filter area, combined with a radiused inlet and unique S&S stinger allow smoother, faster airflow for more power. Kit includes a backplate, filter element, top cover, hardware, and instructions. See Additional Information below for complete fitment. Includes Chrome Mini Teardrop cover, 85% of original