I'm assuming your saw is a model 351.228040 or a 351.228020. Manual is here.
See page 18, Figure 7 for the Blade drive exploded diagram.
Sears doesn't appear to have a part number for the fan and fan guard.
It looks like you can replace the entire motor and key for $217.55 (as of 6/13/2010) which isn't too bad for a 3 HP motor. Part number is 15094.00 and clicking it will link you to their parts site.
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