Shown in the 240/260 Owners Manual Page 52A-1 will list all of the Lines for the Rudder, As Line 1, Line 2, Line 3, and the 4th Line Rudder Up/down Control Line.
The Block with the Becket is used inside of the Rudder Post.
The Block with out the Becket is used with the Rudder Up/down Control Line.
Please check to make sure the part you're replacing looks like the one in the photo. There may be small differences due to manufacturer upgrades and redesigns.