There was a pre-1954 dark gray - most likely what Bill Hirsch Auto is selling as 1929-1952 (all 216/235) and 1953 (manual transmission 216/235).

There was also a lighter gray used from 1954 an onwards on 235s (except for a few years/models).

The shades of gray have been long debated here. To no conclusion/agreement. Here is one thread. In that thread is a 20+ year old article on engine colors.