Hi Mitch
I converted my pile-o'-bits 6v ST70 into a 12v 125 so the original loom is surplus to requirements. The original ST stuff came with the detachable ignition switch section with the key and turned out to be a 3 position switch as used on some non-UK bikes that needed a parking light position.
If you're still looking for a loom I can send you some pics as a PM of what I've got which all seem to be in serviceable condition apart from being a bit grubby.
I can also send you a wiring diagram but you'd need to check the loom against the drawings to make sure you end up with the correct connections.
Hope this helps - you could give me a call on *****.