I had 16" wiper blades when I received my M1009. I replace those with 18" one and they worked really good. I just bought a set of 20". They fit and I am going to give them a try.
On another note, my wipers stopped working for me during a trip the other day. Pulled the wiper motor off the firewall and found a boatload of animal hair (most likely mouse hair, but a lot of it) wrapped around the wiper motor and actuator arm. So much hair that it forced the actuator arm off the motor button. I had to cut it off with a razor. Anyway, got rid of the hair, put the motor back on the arm and bolted it all back on the firewall again. Pain in the butt, but I got lucky. Just figured I let folks know, in case their wipers stop working for no reason.
On another note, my wipers stopped working for me during a trip the other day. Pulled the wiper motor off the firewall and found a boatload of animal hair (most likely mouse hair, but a lot of it) wrapped around the wiper motor and actuator arm. So much hair that it forced the actuator arm off the motor button. I had to cut it off with a razor. Anyway, got rid of the hair, put the motor back on the arm and bolted it all back on the firewall again. Pain in the butt, but I got lucky. Just figured I let folks know, in case their wipers stop working for no reason.