Personally I just upgrade if I keep breaking a particular part or needed it for something else

The rear shock tower I got so I could do a wing mod and have a place to mount the wing easy, if I used the stock nylon one it wouldn't have mounted as easy and would have required some modding.

The front Shocktower I got alum cause I was actually converting a MT1 and the aluminum shock tower cost me $2-3 more than the nylon ones part tree (only part I needed off the tree btw) so I ordered it with the rear.

kinda the same reason the rear hubs. got the rear hub and front knuckle set for less than I could get just the front knuckles.

Now I can't wait just ordered a new stock aluminum chassis, and the solid plastic tie rods and something else (forgot what) for $25 with shipping

BTW been needing the chassis plate cause mine is actually a MT1's plate and my tank almost ruptured from rubbing the drive shaft due to having to jimmy rig the MT2 parts on.
Now all that will be left from its time as a MT1 is the diff's gears, the center gear, dogbones, radio and servo

I've modded this truck so much and had it stripped so many times I can almost assemble it in my sleep