Product review (5 stars): Fairly easy fix, good product and good price
Our old MayTag dryer had it's belt broken and this was one of the matching parts for the belt.  I had a slightly difficult time, mainly because I did the replacement through the front vs opening the rear for a easier view.

A few times in the first few tries, I thought like others, wrong size despite matching part number.  The belt was too loose once I fitted it on and around the drum.  Taking a few minutes to look closer at photos and work slower, I find it is the perfect part and perfect fit.  The biggest problem is how one fits this through and around the pulley? and motor.  It was very easy and I mean very easy to think it was fitted properly and the belt would be loose (too much slack) and immediately think it is the part's fault.  I went and put it on several times and was going to issue a ticket for refund through Amazon before I got it right.

My belief is if online parts places matches your dryer with this part number, more than likely it is the right part and length.  Too much slack is then the result as often it is, due to human error.  Especially if a photo shows a back view and you are working from the front of the dryer vs back.

Please let me know if my review have been helpful to you, it will encourage me to continue writing and updating my reviews, and leave a comment if you have any questions, I will be more than happy to answer if I can be of help.