I belive the part you are reffering to is the crank shaft and i onlt found the one for the .16 engine and chances are you have the .18 and from the price the crank it will be cheaper for you to buy a new engine crankshaft on redcats site 45.99 engine depending on what one you have is 79-89 save your self time and effort
http://www.redcatracing.com/itemdeta...sp?partno=q015