Not sure what you are looking for here. But, the OEM spec for the 08 Nytro is below. Are the part numbers you listed OEM? If not, you are kind of on your own when you buy non-OEM belts. But to get a match, here is a spec for the '08.
V-belt:
Part number/Manufacturer 8DN-17641-01/MITSUBOSHI
Circumference 1,129 ~ 1,137 mm (44.4 ~ 44.8 in)
Maximum Width 34.1 mm (1.34 in)
Minimum Width 32.5 mm (1.28 in)