According to the list I have the specs are the same but part numbers are different.C7OE-E should be 63/64 260(cast no)C6ZE-A,C6ZE-B,C7ZE-B are 65/68 289/302 these are 157 tooth ring gears for both 260 and 289/302, and both have 18 5/16 bolt holes on a 11 3/8 bolt circle and are 20 ounce counterweighted
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