1989 Western Star 3800 Wiper Blade Size

Make / Model / Year Vehicle model years, Vehicle year, Vehicle generation, Vehicle modification, Vehicle trims & specs. Ex: 2022 Acura MDX, 2022 Acura MDX 3.0T, 2022 Acura MDX A-Spec Package	Driver's Side Driver's Side wiper size information “A”= Driver side always has an “A” part number & “A” wiper is a flat curve. 1 inch is equal to 25.4 millimeters: 1" = 25.4mm. Ex: 26 × 25.4 = 660.4mm But Different manufacturers use 1" inch = 25 mm (approx). Ex: 26 × 25 = 650mm (approx). 1" = 25mm is not a standard size. When you compare driver’s side wiper blade sizes from different manufacturers, you will notice the precise length in mm will vary between other brands.	Passenger's Side Passenger's Side wiper size information “B”= Passenger side can have an “A” or “B” part number depending on the vehicle & “B” wiper is a more dramatic curve. 1 inch is equal to 25.4 millimeters: 1” = 25.4mm. Ex: 20 × 25.4 = 508mm But Different manufacturers use 1” inch = 25 mm (approx). Ex: 20 × 25 = 500mm (approx). 1” = 25mm is not a standard size. When you compare passenger’s side wiper blade sizes from different manufacturers, you will notice the precise length in mm will vary between other brands.
1989 Western Star 3800	18 "	18 "

What’s the 1989 Western Star 3800 Wiper Blade Size?