I purchased these Stage 8 brand locking header bolts PN# 8906 many years ago after I bought a set of nice Kooks stepped headers for my 03 Cobra. I never wound up installing the headers on this car, and still regret selling it some eight years later. But I digress. New these appear to cost around $80-$50 plus shipping and sales tax, depending on where you buy them. I will take $30 shipped anywhere to the lower 48.
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