Here is a recap of the O-rings needed for the smoothspyder 2" idler on the ribbed belts, they work great.
They should be available from Ace Hardware and many automotive stores.
They are 2' OD x 1-5/8"ID x 7/32" wall thickness.
The Ace O-Ring part # is 35760
You will need 8 and the are about 80 cents each.
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