18-2206-1 Lower Unit Gear Set for Mercruiser Stern Drives
43-828073A1 & 43-878087A4 ; MR/Alpha/Gen II (except Gen II 2.00 - 2.40 ratios)
- replaces: Mercury Marine 43-828072A2
- replaces: Mercury Marine 43-878087A2
- replaces: Mercury Marine 43-828073A1
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