Changing the bearings within the idler pulleys and tensioner pulley will save you slightly $$ which is atmosphere welcoming. Regretably, Toyota would not offer alternative bearings; You must purchase the pulley using an put in bearing, or with the tensioner, you're compelled to buy your entire assembly. You could see https://bomadirectory.com/listings735302/not-known-facts-about-bill-collection-services-in-anaheim