The outter seal/oring for the dial is available from Toyota (43532-60010). For the itsy-bitsy spring and ball for the dial you are SOL from Toy. I found these parts as part of a 2-speed transmission rebuild kit from a remote-controlled car/hobby store. All gaskets are available from toy.
Other option is used. These are all over the place and most offering them for sale are high...just like the minitruck birfields. Best bet is to find someone that hoards parts and isn't a price gouger. Getting harder to find by the day.