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I bought a used tractor that needs a new belt replacement, the old one was shredded.
Does anyone know the size of belt I need for cub cadet ltx1040?
I find Hexautoparts has many cub cadet belts for sale,what I searched is 5/8" x 41", is it right ?
Thanks.

5/8" X 41.25 is the OEM, 41" should work OK. Just be sure you get a good belt. Many of the belts sold "cheap" are not rated for service on lawn and garden equipment.