If either of you who are interested in early 400 bumpers can get down to Wiltshire in the near future I think my bumper kit is still in component form at Mitchell motors. It would be the work of moments to draw round the individual parts to make a pattern. I think there is also an early 400 on site with original tubular bumpers.
My bumpers were made from stainless steel and are not as strong as the original but I imagine several sets could be made in this way for the cost of a single set to the original spec.
As I don't have the bumpers with me I can't offer measurements of diameters but the vertical hoops are noticeably smaller diameter than the horizontals on all the bumpers I have seen.
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