Hello Robert,
I was restoring 400 chassis number 127 a few years ago and Jeff Marsh who had worked at Bristol for a long time took great trouble to help get a pair of tubular bumpers remanufactured- he used a firm that made tubular railings for yachts and then chromed the steel. One surprising thing was that the overrider (vertical) tubes were not that much smaller diameter than the horizontal bumper tubes but they look right. I can measure the tubes diameter if you like.
Daniel
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