Doesn't look like the one in my '68 or '69 Chryco69. Couldn't tell you if it would work or not. Sorry bud.
Believe you're looking for this:
http://www.ebay.com/itm/1967-68-69-70-71-72-NOS-MoPar-Cuda-Dart-Valiant-Coronet-300-Fury-HORN-SWITCH-R-T-/400326636327?pt=Vintage_Car_Truck_Parts_Accessories&hash=item5d3553b327&vxp=mtr
You already have the cast metal piece that bolts to it.