OEM replacements:
Steering Servo (For upgrade, I would suggest something from Savox, Protek, Ecopower, 9iMOD, Power HD, JX servo, or any aluminum case 20-35kg amazon servo should work well)
Servo Saver (For upgrade, any ordinary 25T aluminum or steel servo horn. I personally like to use
TLR 22 horns, but you need to redo the threads if using Traxxas hardware)
Drag Link Rod Ends
Steering Rack (For upgrade, aluminum is the place to be. I like the
Hot Racing ones, the all in one aluminum bellcrank with the carbon fiber drag link)
Toe Tie Rods (For upgrade, there are aftermarket ones but I personally like to stick with OEM steel. Never bent or snapped one before. Snapped like 3 traxxas aluminum links and hated them. If you can find Titanium, those are pretty! But expensive)
Steering Hubs (For upgrade,
RPM if wanting to stay budget/lightweight. Aluminum for durability.
Atomik RC on amazon is good for the price, if not the
traxxas hop up ones are ok but a bit expensive)
(Ps, if you do any aftermarket upgrades with aluminum make sure you put Blue Loctite threadlocker on the hardware and let it cure for a day so it doesn't back out when running)