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Here is a reproduction part for the Classic Stern Bumpers U BUT as a 3 piece kit to reduce the overall costs to help people a little. It will require you to cut and trim back 4 x small mini posts that link the parts. Unlike the picutre these posts will not be red.
The parts are available as individual parts or a set to try and reduce the overall cost.
Search - swinkscs - to locate your options
The material is solid nylon but will not be as glossy as the originals but allows you to keep you games close to original and functional and quieter than the newer metal rod & ring parts. A upgraded = U, has also been developed to fill in the ribbed section to strengthen up the ring more to make them more reliable and last longer.
Select the colour of choice and place your order.
Note: the price is determined by Shapeways formula (print volume and handling & processing costs) so I apologise for the costs - make sure to check out the kit option.