Product review (3 stars): NOT OEM, NOT Genuine Whirlpool, some parts did not fit but still okay in *MY* case, YMMV
Warning - this review is lengthy and meandering, like a good river.

Not happy with being shipped a third party aftermarket kit - "Exact Replacement Part" ER4392067.  This is NOT a whirlpool kit, nor is it genuine replacement and I'm  unhappy with the way it's being advertised.  This aftermarket kit is easily found for 30% less than the price I paid here, thinking I was getting actual Whirlpool parts.

Now on to the kit itself. This is NOT a review of the "Genuine Replacement Parts" Whirlpool 4392067 that is advertised.  This is a review of the Exact Replacement Parts ER4392067 (as found here: http://erparts.com/the-part?erp=ER4392067) because this is the actual product I received:

The kit included all the parts shown and advertised, and even a few parts my machine didn't originally use.  The quality of the components visually appeared very similar to the ones removed from the  dryer. The idler pulley (ie the tensioner) came loaded with grease and slipped right onto it's axle with a good fit.  However, the weight bearing wheels (or 'bearings') did not slip on - for the rear I had to very carefully work them on (even after greasing),and the front two simply wouldn't fit at all.  Either they were not precisely machined, or they were not really spec'd to Whirlpool 4392067 - which is exactly the part number Whirlpool spec'd for my dryer.  Time will tell how long the bearings last.  The lack of proper fit means I only got to use two out of the four, and I have my concerns about the two I was able to install and may well end up replacing them sooner than I'd like.

The belt itself was fine.  The instructions were fine.  The triangle shaped plastic washers were fine.  All of it was fine, except for the machining of the hubs in the bearings. I probably could have worked a little to use the old hubs with the new wheels, and am now thinking I should have done that, even though they aren't really meant for replacing the hubs alone.

Buying replacement parts as a kit makes perfect sense- the idler pulley alone on this machine would have cost around 16 dollars (for ACTUAL OEM).  While my machine really only needed the idler pulley, I saw no reason to not replace the bearings and belt at the same time, even though neither the belt nor any of the bearings showed any significant wear.

Would  I buy this kit again ? *Possibly*.  Two of the bearings simply would not fix their axles *at all*, and the two that I did manage to get on were an extremely tight fit.  Either I am incapable of using Whirlpool's parts locators to find the correct kit for my machine, someone extremely stealthily replaced the OEM with ninja like prowess, or the parts were inconsistently machined.  Either way I could only use half of the bearings supplied, and I'm guarded about their longevity. I'm really beginning to think I should have left the old bearings in... if I have to replace these things in 6 mo's I'm going to be pissed.  If they survive a couple years I'll be pretty happy. If I had trouble locating actual OEM at reasonable prices than I would use this kit again, but I would DEFINITELY search for ACTUAL OEM first.

Would I buy an ACTUAL Whirlpool 4392067 repair kit ? YUP. Buying as a kit represents solid savings, include most of your preventive maintenance (not the felt ) in one fell swoop.  And, it really is one of those "if you're going to take it apart to replace one part, you may as well replace all of them" type of thing. I personally have faith that OEM offers more assurances of a correct fit, and I would have been able to use all four bearings. The actual OEM repair kits are available for approximately 10 dollars more than this one, although you undoubtedly will NOT get the convenience of Amazon Prime shipping. You DO have to carefully shop the OEM kits however as the prices I've seen range wildly.  Also, many of the "genuine OEM" parts on Ebay are *clearly* aftermarket, so be careful out there.

Getting actual OEM parts that fit properly would have been 5 stars and a glowing review.  If the idler bearing had not fit (which means I would not have been able to fix my dryer) it would have been 1 star and a return.

So it's not OEM, it's not Genuine Whirlpool and some parts did not fit.  But it was still okay in my case - your mileage  may vary.

Update: I had managed to get the two poor fitting wheels on their axles, which turned out to be a mistake.  3 1/2 months later the wife calls me while I'm on a business trip and tells me that the dryer made a loud "thunking" sound as if the motor fell off and hit the floor, and won't work anymore.  I get home from my trip, tear into the driver - the two poor fitting wheels had seized up and apparnetly never actually rotated; one had a flat edge ground into it from the drum rubbing on it, all of which put undue wear on the drive belt, which eventually ended up slipping off the tensioner pulley (which make the "thunk" as it retracted back).  Left wife instructions to call Whirlpool and get parts directly from them, they came in, and I fixed the dryer a second time.  Next time I'm only buyg parts directly from Whirlpool. They cost a bit more than aftermarket, but ultimately I ended up saving NOTHING using this kit, and having the do  the job twice.  And that's all I got to say about that.