How rare are Ultra Blue 91's?

At least I think my car is Ultra Blue... This car hasn't been repainted, the entire engine bay is blue as well as under the carpeting, as you can see in this picture:

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Any website regarding build numbers doesn't list Ultra blue as a colour that was available in 91, and I highly doubt this car had a chassis up paint job done. According to the VIN this car is indeed a 91 and it was originally registered in 1991 as just "Blue", that's the first thing I checked :D. As far as paint code goes, the sticker is missing from the drivers door :mad:

So, who knows what's up?

Finally, some pics of her after the weekend cleaning.

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Cheers.
 
1991 Mustang Exterior Colors
Color
Code

* Black
* UA

* Medium Titanium
* YG

* Titanium Frost
* YX

* Wild Strawberry
* EL

* Medium Red
* EM

* Vermillion
* EP

* Performance Red
* EY

* Bimini Blue
* K3

* Twilight Blue
* MK

* Ultra Blue
* MM

* Jewel Green
* PA

* Calypso Green
* PM

* Oxford White
* YO

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1991 Mustang Interior Trim Colors
Color

* Bright Red
* Saddle
* Opal Gray
* Black
* White*