I have been looking for a telescopic steering column for my 1967, now some people are telling me that there are 1968 columns being modified to look like 1967's and sold as such but they aren't correct. The million dollar question is how do I know that the column being represented to me is a real 1967 telescopic one and not a modified 1968 telescopic steering column? What do I look for to verify originality/authenticity?