We use 48-P spurs, as Dan said. Changing spurs on the X - 5 is really easy. The most imoportant part of it is that you do not change the belt tension when changing spurs, and belt tension is very important in any single-belt car. So once you get it in the "sweet spot," it stays there so long as you use the same belt and pulleys.
Yes, changing spurs does mean you must re-set the slipper tension, but that's really easy. The slipper assembly is straight out of the Losi buggy, not from the xxx-4. And we usually run the slipper pretty tight. So, before disassembling the shaft, tighten it all the way down and count the turns of the wrench. On re-assembly, tighten it all the way down, back it off, and you'll be very close to what you had before.
To change a spur one needs only remove the four bolts in plain sight that hold the top cover. The shaft pops out from there. One right-hand thread locking nut holds the shaft assembly together just like on the buggy. After you've done it once, changing a spur is about a 3-minute job.
Have fun on Boxing Day. I wish we had Boxing Day...
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