Only serious answer is to go for Mulfab aluminium radiator. Check out options by clicking on image.

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Note given the increased cooling, the optional larger rad fan they offer won't be needed unless you intend using car in a particularly hot country. OE fan can just be swapped over.

Richard

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