I think the question is body style that was only 1 year.. Some of my favs had 2 year runs..in order 1) 69 & 70 Wildcat 2drs and convertibles (hey they did change year to year) 2) 65 Lark/GS 3) 66 & 67 Lark/GS 4) 73 & 74 Century/GS I've always been different..guess it's from where I fell outta moms car and landed on my head as a child but anyway...there ya go. I still like all Buicks in general though.
My favorite is the 73 Cutlass Supreme. Even though the body style continued, the 74 and up bumpers made enough of a difference in the body to ruin the lines for me.
WOW... I forgot about the '58 Chevy Impala. What a sweet car! GM sure got that one right. Luckily, there are 2 or 3 of these in pristine condition near me to drool over at local car shows. I'll never be able to afford them either.