Ask Gemini if they can re-order, or special order for you. Otherwise they may even give you the name of the supplier. Next option might be to get an automotive engineering firm to turn some up for you out of a suitable type of steel.
Funny thing is that I vaguely recall a similar thread here on this forum some years back - cannot remember what the outcome / solution (if any) there was in that instance, but it might be worthwhile to look back for it. (If I get a little time later, I'll look as well.)
Good luck.
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