The early simple bent brace was used on all Corvettes from '55-'61 and on '62 Corvettes with manual transmissions (all of them had bellhousing-mounted starters); see photo below. The curved/stamped one we're familiar with on Camaros started on Powerglide cars in 1962, which was the first year of the aluminum Powerglide - those cars (and all 283/327/350's from '63-up) used the block pad-mounted starters we're used to seeing.