Spares, spur gear RW if poss,
hinge pins, they all seem to bend fairly easily although I've not had the TD hard ones but Tresray, Lunsford and std ones all bend.
I think I went through more wings on the 410 then any other car before it, until I put an LMR wing on, made it drive nicer to
That's it really, you can always add wishbones on, but I only broke one in 3 1/2 years, never did a shock tower, although I didn't have the "fine adjust" ones from the V3, the old "full fat" ones look much stronger.
Not really spares, but swapping the ball joints for the Lunsford kit will make it bombproof.