schuyler AOAI Forum Member Posted 09 May 2015 - 12:43 PM FYI. I replaced the black rubber hose (see page 1 in the parts book} that goes from the supercharger air cleaner to the breather tube on my 1963 R2. The hose is shown in the parts book (parts book page 14) as #1557852. After looking at a "zillion" hoses at O'Reillys parts store, I found that Gates part # 18071 fits almost perfectly. Even the spring clamps work. Hope this helps someone.