Yes as others said, beware using the original, as the heat in the engine bay can make the plastic very brittle, and a break can cause a short, or worse still, a fire.
Why not pop up to an auto electrician in Sale and ask his opinion though before you buy a new one, as sometimes they can be repaired. I've successsfully retaped looms when they weren't in bad nick on a couple of cars I've rebuilt.
For Melb suppliers, best prices would be Pete at East Coast Mustang Parts, or Steve at Mustangs of Melbourne, and they will have a way to despatch a loom down to you.
For the 67 you'll need to tell them if it has fog lights/tacho or not.
You'll also need a pack of the black plastic clips that attach the loom to the inner guards etc., which are cheap as chips.
