Do NOT remove the clear plastic.
Wires can be at the top or the bottom - doesn't matter.
Put one rubber piece on the mounting surface, then the transformer, then the other rubber piece, followed by the large metal washer, then install the bolt. Do NOT over-tighten the bolt - just enough to keep the transformer from going anywhere.
If you're AC source is 110/120V, connect the Violet and Blue wires together, and connect to one side of the AC supply. Connect the Brown and Gray together, and connect to the other side of the AC source. If your AC source is 220/240V, connect the Brown wire to one side of the AC source, and the Blue wire to the other side. Connect the Violet and Gray wires together, and seal the connection up in some heat-shrink tubing.
Connect the Orange and Black wires together, and connect to one AC input of the rectifier. Connect the Red and Black wires together, and connect to the other AC input of the rectifier. Connect the capacitors with the - terminals to the - terminal of the rectifier, and the capacitor + terminal to the + terminal of the rectifier.
Regards,
Ray L.