lower sprocket

ok guys I have a 2000 325 magnum 2×4 and I had to buy a new lower sprocket for the crank for timing there is suppose to be a spacer but I don’t recall one there everything is nice and tight and seems to be in place can anyone help with that and when I put that back together is there anything to line up on the lower half for the timing I marked the stator plate like they told me to thanks for your time