Do they make these for G-scale track?

 These gadgets are made for O scale or 027 track.  I think Lionel calls theirs a 153C Contactor.    They are very handy to activate accessories when a train goes by.   I use them on my G scale track but it would be a lot easier if they made something similar that was made to fit on G scale track.    If anyone knows the answer please let me know. Thanks, John