Is this the same part as being discussed? (I do like pix!).. 
Gary I wonder if yours are original, maybe they are assembly line correct with the extra number cast in the side?
Gary's are what I've noted as assembly line correct. Later service replacements did not have the part # embossed but not sure when that changed. As stated earlier I have not noted any yellow paint on my originals or some service replacements I had. Did not note any on Skip's 69 Orange Z/28 Survivor when we had it lifted and reviewed and looked for any paint markings, etc.
This is a picture of one of our originals, 1968 01B Z/28