Regarding ERW wishbones, it's a taboo subject. Not many people on here are structural engineers. The general mindset is that wishbones are a safety critical component, so compromising on their strengh is not something we laymen want to give advice about.
As a *cough* software engineer *cough* I would say that most probably you will be fine with ERW wishbones, and you should look at a thickness of 2 or 2.5 mm. The quality of your welding will probably be a more important factor than the ERW/seamless choice.
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