Difference in rear arms

Can anyone tell me what the differences are between a 2010 and newer models. I looked up some part # and seems to be a few different #'s. But shopping around for aftermarket arms there doesn't seem to be a difference. The reason I'm asking is because I'm really looking hard at the highlifter gear lift but they said there's something different about my 2010 arms so the kit won't fit. Any help would be appreciated.


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