Attwood Lock N’ Stow Outboard Supports: Mercury vs OMC
Lock N’ Stow supports hold compatible outboards forward for trailering without connecting the lower unit to the boat trailer. The three Attwood models are listed for different engine families. Match the exact motor model and bracket geometry before ordering; horsepower by itself does not confirm fit.
Exact model comparison
| Attwood MPN | Engine maker | Listed applications | Support type |
|---|---|---|---|
| 10107 | Mercury | 200/255 OptiMax; 225/250 hp EFI | Engine-mounted steel support |
| 10108 | Mercury | 135/150/175 OptiMax; specified 75–200 hp EFI | Engine-mounted steel support |
| 10309 | OMC/Bombardier | Listed 1989-onward engines, 100 hp and higher | Engine-mounted steel support |
Before choosing a replacement
- Read the exact engine model, serial number and year, not merely horsepower.
- Match the support's original mounting position and hardware to the engine manufacturer instructions.
- Compare the motor-bracket shape and available clearances before choosing between 10107 and 10108.
- Follow the motor manufacturer's approved trailering position and support recommendations.
- Do not alter an unlisted engine bracket to fit a different Lock N’ Stow part.
Matching Attwood parts
Related marine trailering support
Attwood adjustable transom savers with trailer brackets. Transom savers do not replace boat-to-trailer tie-down straps.
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