4 ball trough opto transmitter and receiver board set. These boards come with new rubber grommets and metal spacers
Williams #A-18617-1 & #A-18618-1
Used on the following games:
Attack From Mars
Cactus Canyon
Champion Pub
Cirqus Voltaire
Congo
Dirty Harry
Indianapolis 500
Jackbot
Johnny Mnemonic
Junk Yard
Monster Bash
Medieval Madness
NBA Fastbreak
No Fear
Revenge From Mars
Safe Cracker
Scared Stiff
Star Wars Episode 1
Theater of Magic
Tales of the Arabian Nights
Who Dunnit
