I'm not sure what Willie does but, Savane and John Pearse both make silk wound strings (manouche) that I use on a Gitane D500. They are steel on the E and B, however, much like what Django Rheinhardt played. Not the same sound as Willie's. You can, however, use nylon stings on the D500. Some do and from what I've read,Rhienhardt did occasionally, as well.
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Barrett
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