The items that I'd recommend are:
Steering blocks
C-Hubs
Drive belts
Spool outdrives
Rear uprights
Driveshaft C-caps
These will break/wear/strip threads at some point.... It depends a lot on how well you drive / how many crashes you have
![Cool 8)](./images/smilies/icon_cool.gif)
Steering blocks are the most common to suffer. TBH, the XRays are pretty tough and seem to survive most bangs and knocks.
Other stuff I keep, but are really only replaced seldom/if ever, but if you need them, you NEED them !
Bearings (wheel and diff thrust bearing especially, go to rcbearings for these, Xray prices are too high ...
![Smile :)](./images/smilies/icon_smile.gif)
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Steering top hat bushings
Wishbones & pivot pins
Spare driveshafts
Balljoint cups
Wishbones
Shock bladders
Selection of screws and fixings
HTH