So, the double Yama light, what model is it from?

FZ 750 search just gives the one in pic.

the headlight shown is the Koito unit that was also used on some Yamaha FZ 750 model years.

That one has one bulb (well, two if you count parking light).
The CEV unit is the one that has the big reflector. The Koito unit is the one with the smaller reflector and the flat reflector sections on the side.
FZ 750s with dual headlight I think were only 87 and 88.

G.

edit:
what I found on the internet so far is that some US model had the dual headlight (saw a 05/1988 for sale) and according to fz750.net the 85 Japan model had it.