Hi mate, welcome to the forum. I am relatively new here myself, have a look through all the threads as they are full of useful bits of info if you are just starting up.
Are you going to be racing/bashing your truck or is this a shelf queen? The reason I ask is because aluminum may seem like a good idea for strengthening your buggy but in practise it does more harm than good. At least it is not advisable in the areas you mention. Ali a-arms and shock towers will pass the stresses of a crash further along the line and break something there instead. Plastic may not seem as 'cool' as ali but it flexes to absorb a crash and will end up being more durable and much cheaper in the long run. The extra weight will make the truck handle poorly and the expense would be best used for batteries, tyres and spare parts.
If you really were dead set on getting the ali bits, I believe Fastrax used to do the parts you mention. Personally I have only added aluminum to the front hinge pin brace.
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