I don't believe good production numbers have been published on those. That said I've been watching for them over the years, they are plenty rare now, that is for sure. However, that doesn't mean they are hugely valuable, being over shadowed in large by Max Wedge versions. Still very cool cars, a restored one would make a really fun street car. I know of 2 Plymouth versions (base model sedans with 426s & 4 speeds).