While its generally not the best idea to mix tires, if you're going to do it, you are somewhat better off staying within the same brand and tire type (i.e. performance Z rated in this case). The 050s are great tires, I would probably try them on the back, and by the time you've burned through the rears, the fronts should be worn too, so you can then decide to replace all 4 with 050s or go elsewhere.
Patrick
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