HobbyPartz doesn't carry parts for this buggy, few people in the US do. Most Kyosho Mini-Inferno parts swap over, but unfortunately, the spur isn't one of them. I've been getting my monster Beetle parts at Got Nitro Online
. Their brushless Photon buggy is virtually identical to the Turnigy Beetle. Parts cost more, sometimes a lot more, but they do ship from the US. They also sell the individual diff piece that HK doesn't stock(they sell both metal and plastic diff gears, make sure you get the metal ones). They've got a nitro version of it too, so make sure you're getting the brushless version parts.