Photo shows the position of the spark plug leads on the coil packs. The positioning is reversed depending on which side of the centreline of the engine your coil pack is on. Top is 1.6 & bottom is 1.8.
The numbers are stamped on the back of the metal bracket that bolts the coil packs to the cam cover.
The plugs are numbered 1,2,3,4 with number 1 being at the front of the engine.