The part#(NNN) NNN-NNNN it is about $95. It is #5 on the lookup below.
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The repair is not very hard. You will have to take your time with the new bellows. They sometimes come wrinkled and will be hard to fit and get the clamps back on.
Open the door and locate the sping clap on the bottom of the bellows where the door meets it. Pull it off and then pull the bellows off of the front panel. Remove the fill tub and turn the bellows to the inside of the drum. Here you can remove the outer clamp and remove the bellows. Install the new bellows and if the door does not want to stay closed use a little detergent on the glass and run a cycle with hot water. If you keep the door closed after the first few cycles it will help to shape the new bellows.