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Yes, there is a carbon contact pin that goes there. It has a spring and rides on a brass ring attached underneath the steering wheel or wheel adapter.
The contact pin 32331350750 is available from a number of sources in the US.
The carbon contact pin requires a brown-yellow wire but in both diagrams I am using, this wire goes directly to/from the horn relay. I have a brown-yellow wire with a female spade off my ignition switch which has switched power so that isn't it. Is it the brown-yellow wire off the dip switch which on mine, has had the spade cut?