John Deere 112L Drive Pulley

I got a new drive belt for this mower, but I am missing a pulley. If you look at that white pulley right next to the crankshaft, that is the one I am missing. This picture is not of my mower, I just found this picture on the internet. Please disregard the green arrow. I have a diagram for this mower, but I cannot find this pulley in it. Can anyone please help, or tell me where to find one. Thanks!

That looks to be an idler pulley... you should be able to find it at most farm supply type stores... also a lot of hardware stores will have them... :smile:KennyV