This high-power IR emitter is a perfect replacement for Williams p/n 5671-12731-00. They are used in playfield opto switches and optical ball troughs. These LEDs work hard, and occasionally fail in use. The symptom is an opto switch that never shows as closed, or problems with the ball trough. The part that we carry has the brightest, narrowest beam in the family.
It matters as to which way you install them, so make a note before you remove the old one!