Well what you need and what you want are 2 different things.
Seeing how you have to pay extra $$$ for shipping I would order both items.
I can post some pics for you tonight to see. I would get the accelerator cable bracket right off quick. What it does is keep your throttle cable on the same plane as the throttle lever so you have a nice smooth and even movement. Easy to install and works great.
As far as the trans kickdown cable kit, it really isn't neccessary. However it is very easy to adjust, provides a nice smooth movement and eliminates any guessing if you have all the linkages adjusted properly.
I would recommend getting both and don't forget to order the stud while you're at it. The website says what you'll need depending on what carb you are running also. I sent them an e-mail and they responded within 24 hours with the answers I needed so if you want to clarify about an adapter for your carb and linkage, just send them what you have and they will let you know.
In your pic, I don't like how the trans return spring pulls at an angle. Also the red arrows show the plane of movement that I would prefer to have for the carb and the trans linkage. You'll see when I post my set-up tonight how everything lines up and moves together.