I don't think that ou will be able to find an OEM replacement belt for a V6 w/out A/C. All V6 comes standard with A/C.
I don't think that you can either find a belt taht will fit on your engine w/out the A/C compressor, because of the drive belt pattern.
You can do is try finding an idler pulley and bracket that you will install in place of your A/C compressor.
Nic.