I stick with OEM belts ..... I learned the hard way on Pop's old Ariens YT11. Iirc Ariens used a unique belt pitch .... I went through a bunch of brand name belts (couldn't seem to keep belts on it) before I went back to OEM- the problem went away. I smoked the belt at about 50 hours on my '07 X320 after switching out the snowblower- it's one LONG belt that does the job of your two and I didn't check the routing carefully enough. At $60 or so to replace it you can bet I'm a lot more care on checking the belt routing these days. That JD replacement belt has a little over 600 hours on it and I'll have to replace it next season. If your pulleys and spindles etc. are in good shape, a JD belt should get you a lot more than 60 hours.