Craig, any chance you can post or email a photo of your 48" deck? I can get you the part number of the pulley if I can see what version of deck you have. There are 3 versions but two of the versions use the same center pulley. The early version, like the one in the two photos I posted uses a different center pulley. Note that the early version has a very short discharge chute and has a guard hoop. The 2 later versions have a longer discharge chute and no guard hoop.