What size windshield wipers do I need for 2009 Prius?

2009 TOYOTA PRIUS 1.5L L4 ELECTRIC/GAS Wiper Blade | RockAuto

 

Mine are:
Drv Side 26"
Pass Side 18"
Rear 16".

I usually just get the blade inserts which are a universal type that you snap the metal inserts off at the closest score mark and cut the blade length to match so I make mine as long as practical. (Mine are therefore 0.4 and 0.1" (respectively) longer than the above measurements.)

With getting inserts IIRC there are different blade widths left and right. D - 8 mm; P - 6 mm. Not sure if they are designated in mm or inches in the States, but if I had to guess they probably would be (just under) 3/8" and (just under) 1/2" respectively.

The exact measurements in mm are D - 671; P - 460; R - 400. (max 406)

I don't know if that is of any help.