I’m not sure about the fitment on 68-70 I never looked at the ones on my 70 I used to have, I’m sure the blades would work...And I believe 3 speed and 2 speed are different, these are for a 2 speed motor.Just curious, will these fit 68-70 Coronets?
And does it matter if it's a 2 or 3 speed wiper?