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One thing to consider is buying a brush that is a little bigger and cutting it down to size. Not ideal by any means but workable if that is the only practical solution.
A quick search for the Baldor parts turned up several possibilities such as this one - https://sleequipment.com/generac-genuine-part-bp5255br00sp-brush-h-2576-hzd-1200-9000.html#product_tabs_additional_tabbed
From a quick search that phone number doesn't go to Baldor now. Based on this article they sold off their generator stuff to Generac a few years back - https://www.bizjournals.com/milwaukee/news/2013/10/07/generac-acquires-baldor-generator.html.