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Did Cub Cadet make a 501U-1111 54" deck for Quiet line Tractors?
You posted under Lawn Tractors and Quiet Line tractors are Garden Tractors. To answer your question, IH (not CCC) built the Quiet Line series. I don't know of any 54" decks at that time. The model number you posted seems to identify a 50" deck but I checked my CPE-2 Parts Catalog and it doesn't show that number at all. Some of the late 48" deck have a reference to U1111 but that's about it, and they were for tractors prior to the Quiet Line series.
That is the earliest version of the 50A and would have come on the late 1x8/9 tractors.
But it is a 50" deck not 54". Maybe the outside dimensions are close to 54" but blade tip to blade tip it's gonna be 50"

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