I have a '75 TGB11 that I will be tossing discs on later this year once they arrive so I will post pictures/updates to this thread. Why this thread? Because I have read it at least 10x now and every time I would go back to researching disc options for a c303 it would lead me here...inevitably.
The kit is from Kamo Oko Vidi and although he doesn't market dual caliper front setups his kit can accommodate dual front calipers. Hubs are machined to whatever bolt pattern you desire. 5/6 lug bolt patterns are a single hub while 8 lug hubs are two piece. I was going to keep the 8x222,25 pattern but decided to change to 8x165,1.
I'll post more as I have it.