The white box should have A square label on the side with the PODtronics logo. It reads:
Single Phase POD-1P-MAX 12. V 200 watt Rectifier-Regulator with Capacitor Designed for 200 watt permanant magnet alternators on British and other European motorcycles. Replaces old Lucas Rectifier and Zener Diode Coventry Spares, Ltd. Middleboro, MA 02346
The Unit has PODtronics 12V POD-1P-MAX YELLOW - AC Input from alternator BLACK 12 volts DC negative RED - 12 volts DC positive www.coventrysparesltd.com
Screened on the side of the aluminum heat sink.
If it doesn't please contact me via private message!