Cobras
CSX2001-CSX2024 did not come with heater-windscreen demister features.
CSX2025-CSX2589 heater-demister systems were standard.
Wind wings, sun visors, and racing seat belts got added as options very early.
During 1963 Shelby American started publishing dealer sale literature specifications for street cars. As the cars evolved, so did the option list. Here is an example of one for sale (I have no connection to the seller.)
https://www.ebay.com/itm/36420381951...Bk9SR6bEp5fMYg
In addition, technically any parts Shelby American used in PRODUCTION CLASSES of any kind of racing under any sanctioning group anywhere Cobras raced were features retail customers could order for factory installation. Some were quite expensive for the time period and did not get to any known factory installations. Road racing tires were a very early option and pretty common. Front stabilizer bars were ordered with some regularity. Rear stabilizer bars were sometimes ordered. A low rise aluminum 4V intake supplied by Holman-Moody and a Holley 4V carburetors was a rare option into the CSX24xx chassis range. Aluminum rocker arm covers, aluminum
oil pans, and more all got added to the list. Outside mirrors were a rare factory option so most that got installed were dealer or owner installed. Luggage racks were popular. American Racing Equipment magnesium wheels were popular. Roll bars, headers in different designs, a radio, an engine
oil cooler, and different differential gears were sometimes ordered. A 2-4V induction system was introduced in September 1963 and some of the last cars completed in 1964 had 1965 engines and automatic transmissions. So on and so forth.
I will not type out every street option or race part option or version of a type 1962-65, I will just say the list is long. To get an understanding of when items became available and how many cars received them would take going through the Registry one car at a time. Few cars were highly optioned, but there were some. The options identified on the tan background printed sales specifications only covered popular options. One street car was well documented with modifications to give the tall buyer more driver’s side leg room for example.
Worth nothing, 1) optional part designs changed over time, and 2) Shelby American very often used one thing themselves while selling something similar but different over the counter. The exact design of what was factory installed depended on when a given item was used. Example: aluminum 4V intake and Holley carburetor. The package was introduced circa January 1963 with a Holman-Moody ‘low rise’ intake manifold with the Holman-Moody logo almost completely cut off and a 1963 Ford-Holley carburetor. When the COBRA lettered intake became available it was used into late 1964. In the year 1965 two street cars and one race car received 1965 MUSTANG GT350 ‘high rise’ intake and the special Holley carburetor created for the 1965 MUSTANG GT350.
427 Cobras
I do little with them, but I have read that street car wise, Shelby American left most options up to dealers to provide and install.