Head gasket for Yamaha Outboard Motor,Mercury Mariner Old series 25HP 30HP 

For Yamaha Part number: 689-11181-A0 (A1/A2), 689-11181-00/02 

Repair for Yamaha Outboard : 25HP, CV30, C30, 30HP series (Year 1984 - 1992) 

For Mercury Mariner Outboard Parts number : 27-19138, 27-19138M, 27-84733M 

It will generally fit the following Yamaha outboards: 30A (1990-92). 

All those Mariner outboards (30A) whose serial number starts with 689