here's a link to an entire modern slipper clutch assembly:
cgi.ebay.com/Traxxas-Bandit-VXL-Spur-Gear-76T-48P-Slipper-Clutch-/370447654746. that's a good deal, i paid way more for mine. and for the shaft to put this newer slipper on i think (99% sure) is this:
cgi.ebay.com/TRAXXAS-3793-SLIPPER-CLUTCH-SHAFT-ROLL-PIN-RUSTLER-VXL-/270638300924.