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The stock bolts are standard 10.9 as far as I remember. Use a simple shnoor washer and they will NOT back out.
I like the look of the bolts being offered here, but have never ever had a problem with 10.9 bolts and shnoor washers.
Yes, I replace them everytime they are removed, but they are so inexpensive that it is no big deal....
12.9 vs 10.9, if they are not breaking it really does not matter. It is the locking mechanism that is keeping the bolts in, not the fact that they are 12.9. A shnoor washer can provide the same insurance to a 10.9 factory bolt, or one sourced from your local quality metric supply house.
This topic has been discussed at length, I think Island and Randy both posted on those threads.
Cheers
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997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3
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