You can fit the HPI 47T or 49T spur for the Savage - not the Savage X - by using [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXFYP5&P=7]this slipper kit[/link] (for the purple tube thing and the bushing - but any 5x11 bushing will work) and [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXDZW3&P=V]this slipper hub[/link]. Basically you slide the purple bit on the redcat shaft, put the pin through, slide the plate on and finally slide the spur (with bushing) on and drill through the spur into the hub and bolt the spur to the hub.