I have in my possession a roll of genuine Spectra Strip cable for all your homebuilt Proton Packs.  I'm currently offering 30 inch strips (enough for one pack) for $18.50, that INCLUDES shipping.  This is the real stuff, braided and accurate to GB II packs, the only variant is that it is 64 pair, not 60, however, the extra pairs can easily be pulled from the strip if you're worried about another Ghosthead counting your wires!

Anyway, you can message me here about it, or you can hit my eBay auction for it.  I accept and prefer PayPal.

I'll be auctioning other items in the near future!