You might try NAPA too. Many years ago I bought a shaft to deck, blade drive replacement belt for my IH Cub Cadet tractor that has worn like iron. I took the original, early '70s POS black belt to a NAPA, and they sold me one based on matching it to size. Whether it has Kevlar in it I don't know. Do you have any pics of these Kevlar belts?

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'06 E320 CDI
'17 Corvette Stingray Vert