Below is a chart issued in a United Delco Bulletin, 1A-93-12 - January 1968 regarding replacement horns for all passenger cars including the 1968 Corvette.
Article ID: 946
Created: October 7, 2014
Last Updated: October 7, 2014
Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/1968-corvette-united-delco-bulletin-universal-horns-946.html