Pachislo Slot Machine Door Sensor from Shimuken.  Fits MANY other Daido machines including:

Bad Boy

Bullet Girl

Fever Beetle

Fever Franken

Fever Ghost

Fever King

Fever Queen

Hanafuda

Henna OJI

Labyrinth

Marine Gang

Ostrich Club

Rival

Shimuken

Street Cats

Top Gun

Top Gun G

Will be taken at random inventory.