There is a little pin sticking out the bottom back of them. This pin needs to be pushed away from the shaft, and then the wiper bodies lift off. Sometimes they need to be pried off, but you have to be EXTREMELY careful to not nick the surrounding paint of the cowl. Keep a mental (or written) note of the "position" that the wipers are in when you take them off, so when you put them back on, they are in the same locations. Also, I belive on a convert. that the two arms themselves are slightly different lengths, so make another note as to which one goes where.
When you put them back on, you have to hold the wiper arm "up" with one hand while you hold the round "body" with your other hand to properly align it over the stud. (they are spring loaded)
Putting them on is a whole lot easier than taking them off. Once back on, make sure the pin is pushed back toward the stud.
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold 1980 T/A SE Bandit - Sold