Ed,
I don't dispute it - GM has always changed numbers frequently to accommodate multiple models and model changes even within the same year of production. My parts manual edition is 6/74 - it showed then as 6273371, fitting Nova and Camaro - by the time I ordered on in the '80's, the part number 356199 was the only one showing available for the 1969 Camaro, Nova and several others. I wish I had been astute enough to order in the '70's - my personal quest for parts started in 1979-80. Up until then, I only bought what I needed for repair or replacement, not for future restorations or projects. Hindsight for me is always 20-20 -
Regards,
Steve