The stock wiper blade according to replacement charts is 21 inches long.

At that length the tip of the blade comes right up to the edge of the windshield trim.

A 20 inch blade will give you a finger's width of clearance to ensure that the tip is not hitting the trim and disturbing the wiping stroke, or disturbing the center clip on the trim (if fitted).

A half inch of wiping action will also be lost at the bottom and the wiper will stick out less to the side when parked.

 

so 20 inch it is. i need a new one anyway. thanks plums

 

Hello Plums....I have always used a 21" blade but what I do is trim about 1/2 " of the wiping part of the rubber but leaving the rest of the body intact in the blade head....gives just enough clearence to miss the trim....works for me ;o))

 

changed my wiper blade last week, the funny thing is my local parts shop listed a 20 inch blade but had a 21 inch on the car. must agree though it comes very close to trim. anyway I put a 21 inch back on and it still misses the trim but only just

 

Great tip! I just put on a 21" blade, but next time it is 20". I use RainX instead of Windex to clean my windshield and don't use the wiper blade in rain, just snow.