wiper blades

hey guys!

quick question, my sister in law needs new wiper blades for her car, ive recommended the aero blades as from personal experiance i find them alot better. just wondering what sizes i need for all 3?



ive seen a few threads on here saying you use different sizes, ive found them to be 21,18 and 16(rear)



ive seen a few of you say youve fitted 20, 20 to the fronts, these wouldnt hit together at all would they on a 25 facelift model?

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