 One uses a vertical elevator with a horsehead on top, and an injector hanging by winch line off it.The Picker units have a picker, and a horsehead bolted directly to the injector.These type of coiled tubing units have a semi-permanent drum mounted amidships (They are generally tandem drive Class 3 trucks, long or so)

Custom/generic coiled tubing gripper blocks, skate rollers, arch rollers

Most gripper blocks, which hold the tubing while pushing or pulling in / out the well are "size on size" meaning they fit the tubing exactly.