i got the counter shaft sprocket through schintz... they get them from d&g chassis. the one you get is set up for a heavy duty racing shaft is thicker in the center were splines are,the but the splines are identical as the stock so it just over hangs the counter shaft some. so what i did was milled down the center to the exact thickness of the stock counter shaft sprocket to make it fit right and it took alot of useless weight and stress off of the shaft its self. this way i am sure i dont have to worry about having a bearing suport kit to use a big off set sprocket. i wouldnt sugest going any biger with out one tho.