I used to break the steering hubs on mine like crazy.
When you get the truck move the linkage to the inner hole as close to the hub as you can. It will save you a lot of head ache.
I would get the following for sure.
I always had those items in my field box at all times. I also kept a bunch of misc. screws in it also. It always drove me nuts to break something cheap and not have it on hand and have to wait 3 or 4 days to get a replacement. So the best way is to just buy when will most likely break.
I have only ever bought from the shop I listed links from and they have always treated me well and have excellent phone, and online service. I am sure other shops carry the same stuff with great service also though.
Also go through your truck before you run and it make sure all screws are tight. You may want to put a dab of blue lock tite on some key screws.
I wish I would not have sold mine this summer. I kind of miss nitro.