FYI, for anyone who is interested, these are not Henry J radio knobs -
http://www.ebay.com/itm/2-VINTAGE-CLASSIC-1951-1952-1953-1954-KAISER-HENRY-J-CORSAIR-6V-RADIO-KNOBS-/222342352629?hash=item33c4a30ef5:g:SHUAAOSwcUBYTLbj&vxp=mtrThey are Seagrave knobs used for Fire Engine panels. They look similar to the HJ knobs and might make a good sub (I never tried them as they have rubber inserts). I have many of them so if you want some for your HJ radio, let me know, I'll send you some for the price of shipping.
This post is informational and intended to inform - it is NOT a criticism of the ebay seller who likely does not know. I have stated many times why I no longer attempt to inform ebay sellers when their ads are incorrect. I will stick to that. If someone else wants to, please do and I hope you have success.
Addendum- updating the post to include pictures of original/correct Henry J radio knobs. As can be seen, the ones in the ad are similar but they are not original HJ parts.
