I know this is an old thread, but.....
I tried replacing the old one with a new Dayco(same part# like OP), but no matter how much I tried, I just could not get the new belt on! Had no problem putting the old belt back on.
I just checked rockauto.com(where I bought it), and noticed that the Dayco belt measures 84.00". The next belt on the list was a Gates(part# K060841), which measures 84 5/8". Then there's a Goodyear(part# 4060840), which measures 84.75.
The Dayco is priced at $17.66. And $19.43, and $21.79 for the other 2, respectively.
It was my 1st time messing with a belt with an auto tensioner. But I'm gonna assume that the extra 5/8 or 3/4 from the 2 other belts should help. So I'll stop trying to be cheap, lol, and go ahead and get the Googyear belt.
Wish me luck.
'03 MDX SBP/Quartz