Wiper linkage questions 67-9 cuda

Hi all, I have a couple bundles of random wiper linkages, as well as the drive bracket from the motor. 1st 2 on the left I believe are 68/9. One on the right is 67. Can anyone tell me if drive brackets are 2spd or variable? Also can the bracket be interchanged between 67 and 9 cuda? The bushings in the 68/9 setup are black, while the 67 is white.
Pics coming.
Thanks
Steve