I'm thinking they just pull off - but don't want to break anything trying. How do you remove the wiper arms from a 70 GS (depressed park)? o No: - Bill
Very small straight screwdriver should be all you need. On the left side of each post,under the base of the arm, you will see the end of the spring retainer clip. Pry this away from the post & then pull the arm off. For the driver's side you also need the move the clip at the base of the small third arm. Third arm used to align the rubber blade on the glass surface.
I always throw a towel around all this before working that screwdriver down there. Prevents nasty dinks in the paint and stainless trim.