My observation. For what it is, an upgrade to a Toyota seal beam system, it's more than adequate. The cost of the individual components exceeds the cost of the kit. All components are marked 12 volt.
For those who have converted to a 12 volt system it will work fine. If you still run a 6 volt system it is not as simple as replacing the lamps and relays with 6 volt components. The wire size(AWG) in the kit is to small for the 6v system. The power wires appear to be 14 ga and the ground wire is 18 ga (1.25mm). In my opinion it should be a minimum of 12 ga for the power.
The kit I purchased will be used to up date the Duster. I will purchase a second kit for the '51, because as I stated originally the housings, relay sockets, and fuse holders are worth more than the cost of the kit. I can supply the 6v components and larger wire and still be money ahead.