my best answer is to hunt e-bay.
my next answer is make one...
the tichey train group sell ph-bnz wire.
I think you will want 0.012, should you go that path.
last but not impossible, sweet talk some one with one out of it.
( you may want to go back to the best answer to understand
how sweet you need to be in your talking)
ETA:
I forgot to ask... what happened to the old one?
victor