bc,
Boston14 posted exactly what you are looking for.
Saying that, there is another alternative..........
There are plenty of Classic Car junkyards...sorry....automotive recycling centers, that might have these morsels still within their yards........you just have to search for them on the net.
One place is that Desert Valley Auto Parts (they had a tv show) that has nothing but these old cars in stock......you just have to make it worth their while to find it for you.
Don't forget, these assemblies also existed in any Impala, Nova, etc back in the day.......
Good Luck......