54" X 32" shower base?

So I have been looking for a 54" X 32" shower base but all my supply houses can come up with is a 54" X 34" base. None of my normal brands kohler, Sterling, salo or mustee have one. I see them online but I don't know the brands and am thinking it is low quality for mobile homes. Does anyone know of a good brand that has a base like that and for a fair price?

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