That sounds like a very special size basket, likely made for Keystone for that application. I would guess they have baskets made to fit whatever space their cabinet designers come up with rather than design cabinets around whatever basket sizes are available.
Have you tried contacting Keystone, or maybe your dealer, to see if it is available thru them?
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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