Is there any source to find out how many of each color Mustangwas produced?

 

For 67 to 73, yes. All it takes is some money paid to Kevin Marti www.martiauto.com to run a special report from the Ford assembly data base he bought from Ford. For 64 to 66, there is no Ford data, but you might get a feel from the statistics in the Mustang Production Guide, Vol 1.
Jim

 

where do you get the Mustang Productin Guide Vol 1?

 

It looks like it's out of print. Try http://www.abebooks.com/That's a new and used internet book store. Use the search, enter 'Mustang Production Guide'. You want Volumn 1.
Jim

 

Thanx for the info sources guys, Irecently aquireda 69 convertible paint code E, Aztec Aqua and was wondering how rare that color was.

 

In that case, as it is not a 64 to 66 Mustang, the info is, as I stated, available in a 'Marti' report.
Jim