I don' see why Subaru doesn't at least offer the cars with either color.
Really, it is not too much to ask, and it just formulates a build sheet at the factory.
Even if they have standard inventory color combinations... why should they be the same for california, or minneapolis, or vermont?
I had to buy used from half-way across the country, to get a Garnet Red Legacy GT, with limited BLACK leather, with a 5-speed manual gearbox.... a 2005 model, when Subaru still offered the choice.
The other rarity is a Regal Blue Pearl '05 GT Limited 5-speed. After 2005, Regal Blue was not offered on the Legacy GT, only the 2.5i, until Newport Blue replaced it in 2007, with a taupe interior only.
2006 went to Paint color = interior color mandate, no variation on most models. It was a BAD move then, it still is now.
Ironically for those who want white with black... the 2009 Legacy GT Spec.B offered all of the GT paint colors, with black leather/blue alcantara seats in a black interior. That included pearl white. The only way to get a white Legacy with a black interior after 2005.
The only color that the 2009 GT offered, that was denied to the '09 GT Spec.B... was Newport Blue. GT mandated taupe interior with Newport Blue Pearl.
And if you want anything that isn't grayscale paint colors on a Spec.B... 2009 is the only year. Otherwise, all silver, diamond gray, or near-black from 2006-2008.
Subaru is KNOWN for blue on their performance cars... Spec.B didn't offer it, even though it had BLUE seat inserts.
Newport Blue Pearl looks GREAT with black interior... a Forester owner who swapped in an STI drivetrain, and a full STI black interior, with black leather Forester Limited seats... on a Newport Blue Forester... it looks fantastic.
But never offered for sale by SOA, even though the factory could easily build it. (even with the STI drivetrain if they wanted to.)