Top: Non-factory relay. What it operates, who knows...
Middle: Looks like a voltage stabilizer for the fuel and temp gauges, though my SIII only has a dark green wire (12v in) and a light green wire (10-ish volts average out), there could be 2 separate light greens, one to each individual gauge.
Bottom--No idea, other than it isn't on SIII's. It LOOKS like a main power distribution point for the vehicle, though.
--Mark
1973 SIII 109 RHD 2.5NA Diesel
0-54mph in just under 11.5 minutes
(9.7 minutes now that she's a 3-door).