Fastenals are all over the Twin Cities area. Why not just go to M10x1.25? Just drill the holes in your manifold bigger... Or you could just go and get the Helicoil kit for the M8x1.25. To Helicoil, you just drill the ruined hole to a tap drill size for the heilcoil insert. Then u tap that larger hole, and thread in a special insert leaving the original hole. It's easy, I had to do it on my turbo oil feed line on the head. I did it on the car
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