Certain 00 - 07 Corolla model has this funny looking (MS) 6 slot bolt on tensioner pulley, This socket are essential to replace the tension pulley without removal of the tension unit! You can replace it with a regular 14mm bolts as long as to match with the right pitch thread of the MS (Muti Slot) bolts. It may require a 7/8 wrench if space is very limited. i wish they can make a MS wrench.
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[4 of 5 Stars!]