redrill for 7/16-20 and also drill the banjo bolt hole out. I did that for a set of Z06 calipers I had on my corvette and it worked fine.
There is also a company called time-sert that is similar to a helicoil, but I think they are a higher quality fix. I just repaired a set of Camaro calipers mounting bolt holes with their product.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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