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Here's a diagram of the oil pump location. Basically it like doing a timing belt and water pump. You might as well do it at this point since it's gotta come off to get to the oil pump. Then you gotta drop the oil pan. I believe on this oil pan, you have to use a sealant as a gasket. So grab some Toyota FIPG. so I'd change every O-Ring and gasket you see on this image. I'd replace the timing belt tensioner and idler pulley too.
