You can buy them directly from the dealer or any transmission supply parts company. Just be forewarned that if you do not get it installed and seated properly you can crack the transmission housing, causing a huge leak and replacement of the housing. Be sure you get the snap ring installed in the transmission case properly before you start the engine and place it in drive. If you are not too sure of your abilities it is best to have a shop install the parts for you for a minimal charge, should be less than $100 IMO.
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I've made this mistake - it sucked bad. I did not break the case but did have to remove the tranny to recover the stuck servo (it was cocked/lodged in the bore); fortunately in my case I was able to clean the servo bore with 400-grit and saved the original case. Make sure that the snap-ring is seated all the way around, especially at the top of the servo bore.