I would recommend a call to the Gun Parts folks. They have small quantities of parts not cataloged, which may also not be listed on the website, simply because the small quantity doesn't justify the expense. But they do know what they have, listed, or not.
Pre-internet, I know this was the case. Today, one would expect everything to be listed online (its so easy, right?) but, this may not be the case. A call would probably tell you if so, and if they had any of what you are looking for.
E-mail might work too. Just sayin...
Good Luck