I reviewed my e-mails with GTSpec and looked for the package and cannot locate the specs on the bolts. I think they were M10x1.25x??mm and automotive grade. I picked up varying lengths at Home Depot and since they were under $3 each it was a good insurance policy from taking multiple trips (returned the unused).
If you want to be prepared for the installation, e-mail GTSpec and ask them to provide you with the bolt specs and then purchase 1/2 in longer bolts. I recommend purchasing 2 longer bolts for the front and 2 longer bolts for the outside. My package did not come with the 2 front bolts, they expect you to use the existing bolts from the chassis.
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