Go to the site that Magoo gave you and put "throttle linkage" into their search window. There are dozens of small parts and they vary from year to year.
The Toyota 'balls' that I've seen aren't available by themselves - you get to buy the linkage piece that has them incorporated. The sockets can be bought individually but be very careful to order EXACTLY what you need because Marvin will send you EXACTLY what you order.
Not sure what year you're asking about. On mine (77) the ball is part of the carb linkage and it doesn't look like it comes off. You'd probably need the whole piece. I doubt it would be available as a separate part.