My rebuild kit came with a standard replacement set of idle tubes like you have in the picture. I also asked them to include mixture screws that had a standard screw head instead of the D-shaped head on my original screws.
Its still hard to get to my idle screws because they originally had anti-tamper caps over them. The previous owner ground the caps off, but the screws are still back under the overhang of the carb flange. The screwdriver has to be almost exactly horizontal to reach the screws, and its hard to see the screw heads. At that angle my hands also get close to the fan and shroud.