Product review (4 stars): and that worked great.
Knocking off one star because this wasn't exactly the same as the part I pulled off of my White Westinghouse WDG546RBW1 gas dryer, even though both Amazon and RepairClinic said it was. The shaft to which the pulley is mounted was about a half inch shorter, and the u-mount is in the reverse direction, meaning the tension spring just pulled it off of the spindle. However, the shaft was the same diameter, so I took off the pulley and put it on my old idler arm, and that worked great.