The cup is rarer than hen’s teeth. Mine suffered the tab breaking and I tried everywhere I could to get a replacement. It had been welded back already by a previous owner. Nobody, even Rimmers and other specialists had any.
I had to make a new bracket to hold it in place. I also put a few drops of oil down the top to reduce friction stressing it.
Everyone with the same gear selector in owners clubs for Cobra,TVR, everyone else with R380 boxes would love replacements.
I reckon there is potential for someone with the equipment to make them to get some trade. The tab is the weakness so strengthening lugs would help.