I bought a 4 tons - large genuine type lens, but I feel calmer that is more calm than that of Dowa, so I personally like this one because it is close to genuine. It is nice to know the screw hole pitch.
I purchased two yellow and one red. I received one red on shipment later, but the packing bag was torn and a big scratch was on. I will have it as a spare. Because it is troublesome with cheap commodities, we did not offer exchange, returned goods.
Until now, it seems stupid that the dealer has become a good idea, I will fix it myself from now on. Let's not mistake the right and left when purchasing, it can not invert left and right by turning over with the reflector's relation (although it can be installed, it will do funny lighting)