This matching set of Horns, Hi (256) and the Lo (255), Date code (7L3,7L3) November 1967, have been tested, inspected, and sound nice. 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 "67 Original GM Delco Remy Hi Lo Horns (255) (256) 1967 1968 Buick Chevy OEM 68" is in sale since Sunday, October 4, 2020. 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, 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, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay, Russian federation.