Yeah, they're needed, or you won't be making any adjustments to the belt tension. They're 5/8" OD and 3/8" ID...the thickness I can't remember off the top of my head, but you could probably figure that out from measuring the other parts. You want them as short as possible without the gearbox bracket binding. If they are too tall, the gearbox bracket will tilt, mess up your belt alignment, and destroy the belt.
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