It turns out, as with a lot of things on these props that even the zip ties on the Hero's were Milspec, with steel locking pins in the head.
Two ties were used on the thrower, one through a hole in the underside of the handle, just above the grip then another going through that tie and wrapping around the split loom.
Apart from the Super Hero pack which used one standard black zip tie here looped through two holes at the face of the handle
I wasn't able to see if these were used on the ribbon cables due to the part being so small and the available reference from before the GB2 conversion being so sparse.
I'd be surprised if they weren't though.
(Thanks to Julz for the reference pic of the underside of the handle)
As you can see from these photos, they have an odd dome shaped head and lack the notches that are on standard ties.
Instead , they have a series of raised stipples and strips.
After a bit of searching I finally narrowed it down to the correct brand, so here's the info.
Dome top barb ty
Serial#: BT1. 5I-C
So there ya go.
A little detail no one will give a crap about let alone notice but that's what they used