I can help on the production cars. Introduced in 1962 as part of the Invicta line. LeSabre and Invicta had the same wheelbase that year. Wildcat production @2000 units 1963 Wildcat became its own series, 35725 produced. Electra 58645, LEsABRE 181204 LeSabre and Wildcat 123" wheelbase Electra 126" 1964 135163 LeSabres. 84246 Wildcats, 68792 Electras, electras still 126" 1965 144996 Lesabres, 98787 Wildcats, This year @ 126" as is Electra @ 86810 built. See my 65 At www.buickstreet.com !! See production info @ www.buicks.net