Does anyone know of a website or other source that breaks down production numbers by color? I have a 1972 Radiant Green Cutlass Supreme. I know this color was 72 only and avalible on A bodies only. I would like to know production numbers. Thanks.

I might suggest specifically looking for production numbers sorted by paint code.
GM (Oshawa, Canada) is helpful for assisting enthusiasts in decoding and authenticating VIN codes and build sheets.
They just might have kept paint code records.