I think that all your rear tires are 315s. As long as they are all the same size and manufacturer, I think you will be fine. There have been a number of "Tire preference and suggestions" threads on here over the past 12 months. Should easily find them. Toyos are often mentioned.... I ran those on my Dynasty when I needed to replace tires (but those were 295s).
Gary and Dee, Zowie and Bowie (traveling cat sibs)
2019 Cornerstone 45B, X15-605hp, Imperial, Spartan K3,
2013 Honda CR-V toad, Demco Excali-Bar II,
Demco Baseplate, Demco Toad Light system, 73 de W5Fi