Trivia Question 16 - Dealer Option One Year - Factory Option the Next!

OK..Here is a trivia question I have meant to ask over the years but never got back to it. The question is:

What option was a Dealer Installed Only Option in 1963, but became a Factory Option in 1964?   
I know of one example... there may be more. 

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Nope.

RH mirror?

twilight sentinel?

Nope.
Nope.

 Rear window de-froster?

Bingo. We have a winner. More details in a bit.

We had some great guesses but Robert Shannon gets the Cigar as Rear Window Defogger (Defroster) is correct.  See the Dealer Data Book scans below, not to mention Robert's Cigar! 
Running through the other guesses:
AM-FM Radio --> Factory Option both years
RH Mirror --> Dealer Option both years
Twilght Sentinel --> Not available in 1963, Factory Option in 1964 (new for 1964)
seat belts --> Factory Option both years, with front seat belts becoming standard equipment part way thru 1964 model year.

Rear Window Defogger ==> Listed Dealer Option in 1963, but available as a Factory Option in 1964.

And for Robert.... Have a Cigar!!!!

Congrats Robert.

Jason, question: does the Sedan not have a speaker on the right side of the package shelf like the Coupe?

Kurt, The rear speaker was mount on the right side of the package tray for cars that had the spare mounted on the shelf, which included the the Coupes in 1963, and Coupes and 4 window sedans for 1964, but in the center on cars with the spare mounted on the trunk floor pan which included the 6 window sedans, and Fleetwood 60 Special. The picture for the 63 defogger looks to be a 6 window Sedan de Ville. I think you are asking since if the speaker was always on the right, the far right side vent would have been in the same general location.  
As a followup question and really getting into the nitty-gritty is:
What is the main different between the 63 dealer installed and 64 factory installed defoggers? Well, as seen in the picture, the 63 dealer installed has 2 outlet ducts, whereas the 64 only has the one on the driver side. 

 Jason ,my 63 6339  spare tire mounts on the floor  on right side , speaker in the middle of shelf ; is  that not correct?

Robert, That is correct. ... I should have included that note. For 1963, only the Coupes had the spare on the shelf. In 1964, the 4 window sedans also had the spare on the shelf.  I will add that o my note above. The bottom line is for cars with the spare on the floor, speaker was in the center.. at least on the cars I have seen.

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