I haven't had any luck finding them... any chance of modelling the bit out of plastic rod and card? I think the bit is pretty much the same on the warriors guns, just doubled up vertically.
I cut one of the blade nibs off of two of the end bits and glued them together at the cuts and it worked very nicely for my warrior to immortal conversions. Not sure how well it would work on the real thing though. It'd be easier to do than finding the bit alone, however.
Edit: you can see pics of the conversion in my gallery
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