Actually that Obiwan is a one of a kind prototype done for Luke 8)
It was done from a Parks EL Hilt and doesn't fit easily nor is there room for sound.
I have Ideas for doing the thin neck but they require prototyping and expense and time
as well as a parks hilt for the donor.
Eventually it may come to be but it takes time...
But once it does become available, believe me everyone here will know ;)