Stern Backbox lock assembly consisting of the following parts:
4 hole mounting plate (535-8128-01)
7/8" barrel lock with 1-1/2" latching cam (355-5018-02)
Security mounting screws (237-5947-00)

Used on the following games:
Striker Xtreme
NFL
Sharkey's Shootout
High Roller Casino
Austin Powers
Monopoly
Harley Davidson 2nd Edition
Playboy
Rollercoaster Tycoon
The Simpson's Pinball Party (late runs may have used assembly 535-8128-01_355-5055-00)