Product review (1 stars): Buy two and keep one for next time.
This is a dishwasher part which connects the dish rack to the chassis of the machine.
First, the part snaps onto the rack.
Next, the connection is made via two plastic wheels(on the part) which ride in an aluminum rail(attached to the inside of the dishwasher box).
The fitment is fine and the part works as promised.

Failure!  The entire part is made of plastic.  The wheels are attached to the part with plastic prongs.  The prongs break and the wheels come off the part.  Now your dish rack is sagging and you're scratching your head, "Why?".  I literally go through 2 of these parts per year.  In fact, I buy one in advance and keep it for the next eventual failure.  I can change that thing out faster than the Maytag man!
A man knows no fury like a woman whose dishwasher is broken!  But I digress.

If you need this part, you probably need these parts also!  I have found that if you replace the part with broken or missing clips, IT WILL FAIL QUICKLY.
positioner
W10195840
http://www.amazon.com/Whirlpool-W10195840-Positioner/dp/B00DZUB24A/ref=sr_1_3?ie=UTF8&qid=1404307408&sr=8-3&keywords=W10350376
$15

adjuster
W10195839
http://www.amazon.com/Whirlpool-W10195839-Adjuster/dp/B00ECV65W0/ref=pd_bxgy_hi_img_zS
$16

clip lock adjuster arm
W10250160
http://www.amazon.com/Whirlpool-Part-Number-W10250160-CLIP-LOCK/dp/B008DJNMLO/ref=pd_sim_hi_3?ie=UTF8&refRID=03357F2BD3JNA6CH5237
$16
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The rest of this is my rant and experience with dishwashers.
I have a Kitchenaid KUDS301XWHO dishwasher.  I have had nothing but trouble with it since I bought it.  Although we wash the dishes before loading them into the machine, they have never and will never, come out clean.  Every year the machine pretty much stops working and needs a repair.  If you buy one, I definitely recommend the extended service contract.  I'd buy another machine tomorrow if I thought it would be better.

Sadly, our government and the manufacturer nations have conspired against us.  Not so long ago, you could buy a Kitchenaid machine and it would last at least 20 years.  It was loud.  You could hear it all through the house.  Indeed, you could feel it rumbling under your feet!  You couldn't hear the TV when it was on, LOL.  It ran for an hour, the dishes came out too hot to handle and they actually came out clean.

In contrast, our new machine is very quiet.  While you can definitely hear it while it's running, it's not much louder than the refrigerator which stands next to it.
First and foremost, the "dish washer" doesn't!  When the cycle is done, the dishes come out crusted and dirty.  Any water the machine saves is surely lost by our pre-washing the dishes by hand.
The new machine is always broken.  I have already done more repairs on mine in three years than we did on older models in 25 years time.  Ditto, my comments from above.  The cost for the 4 parts above(to replace one side of a broken rack)total about $75.  These parts are not covered by the warranty.  I repaired the food chopper myself and recently, we had the touch pad, pump and motor replaced on our 3 year old machine!
The new machine's cycles run forever!  This is especially annoying when I'm entertaining and need to run a wash between courses.  Impossible.  Also, the machine has no rinse/hold cycle.  I like the rinse/hold cycle because it does what it says . . . rinse the plates to wash them later, or tomorrow.  So, I can rinse the plates by hand then load them into the machine or just run a 3 hour wash cycle for a machine that's half full or less.  Ridiculous.