Below, is a Dealer Service Bulletin from G.M. of Canada regarding revised frame dimensions for the 1968 Corvette:
Article ID: 1230
Created: August 7, 2015
Last Updated: August 7, 2015
Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/1968-corvette-service-bulletin-frame-dimensions-revised-1230.html