This matching set of Horns, have been tested, inspected, and sound nice. This particular set was removed from a Buick. GM Horns from 1963 thru 1972 are the same, but there is a few different brackets.
Look at the pics and see if these will work for your application. The item "Buick 69 GM Delco Remy Hi Lo Horns (051) (053) 65 66 67 68 OEM 70 OEM Wildcat" is in sale since Sunday, January 31, 2021.
This item is in the category "eBay Motors\Parts & Accessories\Vintage Car & Truck Parts\Other Parts". The seller is "fishwallman" and is located in Minot, North Dakota. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay, Russian federation.