Product review (5 stars): Worked and saved money!
My LG front loader with the control panel on top of the dryer, near the back - started making a huge racket.  It then would get stuck and to start it you would have to open the door and roll the drum around and try again.  I read online that these were the ones you needed.  NOTE:  These are only the wheels, not the posts or washers or little triangle plastic things that hold the rollers in place - and only ONE wheel per order, not two.  I bought four, and took my dryer apart.  I unplugged the unit, popped the top open from the front - there are two latches you have to open with a putty knife near each side.  Then I just took off the screws on top, took the screws off the door panel (Kept the door on), then popped and lifted the front door panel off.  Then unscrewed 2 screws to take the metal thingy off where the air goes after it goes through your lint filter in the door, then 4 screws to take the front of the drum holder off.  Then you reach under the drum, hold back the pulley tension wheel and the belt comes loose.  You use the belt to lift the drum out.  There are two rollers in back and two on the inside of the front panel that you took off.  I kept the posts as they were fine.  One of the plastic holding clips was missing, and one wheel had broken the inside hole wide open.  You carefully pull the plastic triangle holding clip off (they break sometimes) - if you break them, I used what I believe was called a 9/16 "E" clip you can get at any hardware store.  They also sell this wheel in a version on Amazon that comes with the posts and clips completely.  I only replaced the front two rollers, as the ones in back were fine.  I cleaned the dryer out with a vaccum and then reassembled it all.  Took about 2 hours including a trip to the hardware store.  One guy online said to use a 1/2 inch "E" clip, but it didn't look like it was big enough.  I could get the 1/2 on, but the 9/16ths seemed to fit better.  I ordered 4 of these, but only used two.  No worries, I have two backups now and I fixed my dryer for under $50 instead of buying a new $800 dryer.  Thanks!  Worked great.  These were pictured blue when I bought them - the ones inside the dryer are blue - these were delivered gray, but they fit perfectly.  Dryer runs quiet again!  No more THUMP THUMP THUMP!