I suggest either buying it from the dealer or getting a Gates belt.
Belt numbers are as follows:
MR18DE
- 11720-EL00A (OEM)
- K060473 (GATES)
HR16DE with AC
- 11720-ED00C (OEM)
- K070448 (GATES)
Odd nissan went with such a beefy belt on the 1.6. It has one more rib then the MR18 and is about 1/16" wider.
HR16DE with out AC
- 11720-BC21C (OEM)
- K070415 (GATES)