Both these hoses show up on various posts here on the forum as good replacement belts.
Different auto parts stores list one or the other, not both, as an exact replacement.
The 4080521 says it's 52.1" and the 4080525 says it's 52.5"
Does the .4" difference matter or does the tensioner have enough play to be okay with either one?

 

Go with the 4080521. I put this one on and it works fine. This is also the Continental number for the belt.