This is Heavy Duty. Bought as a replacement for the Dayco unit. I noticed that the block was thicker than the old Dayco. Didn't have time to put the belt on. We need to go back to the thinner Dayco block. To update! I was very angry because I couldn't put the belt on. Bought Dayco parts at local auto parts store. Had the same problem. Found this part and installed it. The gate part is sturdier and the wheel is metal instead of plastic like the Dayco. I'm glad I figured out what I did wrong.
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