Mercury Tilt/Stop Switches for a Long Tail Mud Motor- Go Devil

[fishingman1]

It's a long story and a unique request but I am trying to find a heavy duty, waterproof mercury stop switch for an electric start motor. I found a picture of what Go Devil uses. I will be mounting this on a Long Tail mud Motor with Electric Start.
http://www.godevil.com/documents/MercurySwitchMountingLocationsandWireConnections.pdf

Does anybody have any suggestions for sourcing this type of part?

Thanks!