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The best alternative to OEM Lexus wiper blades are the the Genuine Lexus Sightline Blades you can buy at any Lexus Dealer. It's a low profile arm and blade assembly (designed after the new factory lexus wiper blade arms). This is superior to any of the off the shelve blades you buy at the auto parts store.
If you can, go OEM. I feel like the IS has one of the best wiper blades from any car I've driven. I've used both Rain-X and Bosch and yes they're solid but don't compare.