I bought a new repo set from Obsolete & Classic Auto Parts in Oklahoma, they still list them when other vendors have long since sold out. I believe that Dennis Carpenter was making them but hasn't done a run for a long time. Here is a link,
https://www.classicautopartsonlineca...%C2%AE-V8/128/
if they can't supply the colour you need, you might have to order a set of knobs and change them.