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From your image above and having 12 inch (305mm) blades with assumption the fan sucks cool air through the rad it looks like this one drawing 12.4 amps would fit from the current Spal range. Please check these dimensions though and accept that the later design, having blade protection and mounting on the periphery, may require you to re-engineer mounts.

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Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone