If you still have the factory blades, toyota will replace the rubber wiper with a new one for a few dollars.
If you want to replace the old Toyota blade, most modern replacements will require a j-adapter. The adapter is usually free, but you'll have to request it -- it usually doesn't come with the wiper. The adapter screws onto the two existing screw points on the wiper armature. The new wiper then slots into the adapter.
Sizes vary by manufacturer, but the passenger and drivers sizes are different, and 18" and 19". The screw size is 3mm (1.5 pitch) part number 90099-00913, around $0.63USD.
Also see: Wiper Switch