I can take a look on my truck and the spare I got tomorrow.Depending on we’re your friend lives there may be some hiding in the western Provence's ,Bills truck parts in Courtice Ontario may have some used parts but he gets them from the west . The US manifolds should be mostly the same but not certain they have the same cast numbers .I know my 54 intake manifold had the mount for the horn but as far as I know the horns on the Canadian models were on the firewall or like mine on the rad cradle behind the grill.
