This is the SiFab aluminium radiator (sadly no longer available) that I fitted to my car several years ago.

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Relevant is the top support bracket and it's welding to the top radiator tank. The seam formed in an M shape spreads the load over a far greater length of weld and so greater area of tank.

The Mulfab ones I've seen employ a top bracket shaped to offer just a semicircle of welding seam covering smaller area of tank. Allied to this poor welding penetration leaves nothing in reserve leading to the bracket tearing out top of tank in one case.

Richard

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