Where can I find sheets for a Three Quarter-sized bed?

I am looking to purchase sheets for my roughly 200-year old Three Quarter-sized bed. I have looked pretty much everywhere on the web (including Amazon and Ebay) and cannot find a manufacturer that makes bedding for this custom size. The dimensions of the bed are 48 inches by 75 inches. Also, if anyone knows stores in Houston, TX or the surrounding areas that carry this particular item, that would be helpful also. Thanks a lot!

Answers:
Well, I looked and they said that sheet makers do not make sheets that size anymore but here,

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