Was hoping to hear how this turned out, but just ordered a Febi/Bilstein 866 shaft as they are only ~$300. OE is still ~$800 depending on source. X5 is at 108k miles and I am under it doing the transfer pump. The shaft doesn't look rusty like OPs pictures... but I don't want to take a chance with the kind of damage this failure can cause. $300 is cheap insurance.
GL OP, hope you're still able to get these produced if it's economically feasible for you.
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