Yes replace it, you're asking for bigger problems down the road if you don't. The new fan motor usually comes with a new rubber grommet, nut, and screws in a little bag included. IF it's a metal fan blade as long as you don't mangle the blade while wrestling it out you should be fine with just the fan motor. Just be careful with it. IF it's plastic order the blade. Take the bracket out with the fan motor and blade in one piece, do the swap and put it back in.
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