Steering wheel / Horn button help needed.

could be wrong ...but it looks like a pre '71 ralley wheel and your missing this

1968 1969 HORN PAD ADAPTER ROADRNNER CHARGER MOPAR WOOD B BODY | eBay
and the correct dart horn cap

I bet some one here would have the parts//:icon_fU:



and for any one needing a horn switch//they haven't changed in 23 + years this works !!

1967-90 HORN SWITCH NOS P/N 2822126 For DODGE CHRYSLER PLYMOUTH MOPAR | eBay