On Fri, 27 Oct 2017 09:46:47 -0700 (PDT)
me wrote:

By "earpiece" I assume you mean the whole assembly and the answer's
no as they're no longer in production. But even if I could I'd still
rather replace just the broken driver if I can find a way to unglue
it!

Just carve it out with a sharp blade.
Or buy a headset on eBay that has failed on the other side ...