If you don't need an absolute match to the OEM Bertram unit then can you get one made to match the mounting holes, look very similar to the original and give you the height you want.
I wasn't matching anything but made my own mount many years ago out of SS, 304 tubing and 316 sheet. Although it wasn't perfect nobody else has ever noticed or was to polite to point.
Ground the welds, and then electropolished it. It looks good. Now over 25 yrs.
A decent SS fabricator should be able to do it in a few hours. No idea of cost though.
Do a rough sketch and ask. Any friends that can at least cut and make the pieces?. Then the welder only has to weld it.
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