Dual Opto Transmitter Assembly (Stern)
Ref-Part Stern 515-0173-00 / replaces older Part 520-5173-00
used at many newer Stern like
24, Avatar, Big Buck Hunter Pro, Family Guy, Grand Prix,
Harley Davidson, Lord of the Rings, Monopoly, Mustang,
NASCAR, Pirates of the Caribbean, Rolling Stones,
South Park, Spider-Man, Star Trek, TRON Legacy