There are two on Ebay right now. Search Mopar 1822668. Also this is a great video to replace the horn ground strap (the copper strap) using shim stock.
Have had many Chrysler, Dodge and Plymouth over the years. Got started with helping my Dad work on his 57 Chrysler when I was around 6 yrs old. There has always been a Mopar in the drive.
Location: Mansfield, Ohio