Door lock cylinder trouble

[Breadstick]

I got locking cylinders for my 64 C10 and they won't lock. I looked at the mechanisms and it seems to lock by two tabs on the cylinder turning and not being able to be pushed in to open the door. I put them in my door handles but they won't turn because there is no place for the tabs to turn in the handles. I got a new set of door handles from So-Cal and they assured me they would work with my locking cylinders. I tried to put them in and it's exactly the same as before. They push in to open the doors but they won't turn so they lock.

Does anyone have a picture of the inside of the handle that works with locking cylinders? I don't want to get a third set of handles only to find these don't work either.