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Would an 18" or a 24" version of Crouse Hinds part#: 500984-331 (20" LR350 L/R SEALED TROUGHER) work in place of the 20"?

It is not recommended to use an alternate length Limberoller in a trougher application on a bracket designed for a specific length.  In using a different size would adversely effect the flow and alignment of the belt.  A smaller roller would cause a "bump" or rise in the belt and a larger one will cause a dip.