Ash is right.
I actually did a lot of research into these prior to doing the Wilwood group buy. I even got in contact with one of the guys in Taiwan that sends these kits out.
From what I found they all pointed to a couple of factories in Taiwan that manufacture brake kits.
Suppliers than sell them under their own name.
There are even more brands (heaps more) that none of you guys would have heard of other than the commonly available G4/D2/K Sport that they trade under, such as Nashin, Kido, G force, JUN etc (see pic).
Basically if you ordered a certain quantity as a supplier (for example 15 kits) you could get what ever colour, style of caliper and writing you wanted on them. Even some different choices in rotors. So for example white calipers with SAU written on them They could even do a 12 piston caliper kit with 400mm x 36mm rotors!
If you knew the prices of some of these kits in larger quantites you wouldn't believe me.
I even spoke to one of my mates about getting money together and designing our own kit to supply in Australia - but we weren't to keen to send $15,000+ to Taiwan lol.
At the end of the day it wasn't something I was interested in but the proof is in the results, they work well.