Product review (5 stars): A great kit at a great price....and made in the USA
This is a great kit, especially when you consider the price. Being lazy, I bought this without tearing apart the dryer first thinking all of that vibration had to be the rollers. Well, it wasn't. I replaced everything anyway, just to be sure. The old belt was getting a bit dry too, so what the heck.

I have a Whirlpool Duet gas dryer (model GGW9200LQ1, manufactured in 2003.) This kit (the 27-inch option) fits perfectly. It comes with exactly the right number tri-rings (dump everything out in a safe place before starting...I thought some were missing but they were stuck inside the package...should be 9 tri-rings.) Please note, this is an authentic Whirlpool kit and is made in the USA. I was very pleased to see that. The wheels are a different color than pictured (blue-ish, not red.)

Rather than use the instructions, there are some very helpful online videos that basically walk you through the whole procedure. It's very simple, but much more helpful to see it in color than trying to read instructions with bad photos.

On a final note, the source of my vibration woes was one broken blade on the fan! Only one blade being broken off throws the whole fan out of balance, and since it spins a lot faster than the drum it makes quite a bit of vibration.