try an ace hardware locally, my local one has the craziest fastener selection, never had issues finding any bolts.

needed some M12 ultra fine thread with 100mm length (very odd) - they had it, similarly had the M5x0.8 and M7x1 needed on some BMWs for license plate and fuel rail bolts.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)