Stern Backbox lock plate.

Used on the following games:
Harley-Davidson 3rd Edition
Striker Xtreme
NFL
Sharkey's Shootout
High Roller Casino
Austin Powers
Monopoly
Playboy
RollerCoaster Tycoon
The Simpsons Pinball Party
Terminator 3
Lord of the Rings
Ripley's Believe It Or Not
Elvis
The Sopranos
Nascar
Grand Prix
Dale Earnhart Jr. LE
World Poker Tour