Have you searched this site and links ?
http://www.vintage-mustang.com/

I have a book I bought many years ago. Name The Mustang Recognition Guide.
The author was Donald Farr I believe.
This book listed a lot of the standard and optional equipment for the 65-73
Mustangs.
If it is still in print, you should be able to get it from a Mustang supply
house like California Mustang.

Erich


"MJT" <mjtheriault @ sympatico.ca> wrote in message
...
> I searched the web for info on what factory options were available for the
> 64-66 mustangs, without luck. Anyone know where I can find it?
>
>
> Thanks.
>
> Michel.
>
>