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+1 for World. Have their bolts and nuts on 2 of my Pcars. On my studded 997, I converted the rears to open end versions since the stud length was for the 7mm spacers that were needed with some previous wheels. When I had my custom Forgelines made, I had them done with the exact offset I wanted so spacers no longer needed and had to make sure the nuts were seating and torquing down properly.
Cayenne is running their longer bolts made for 10-14 mm spacers, which is the proper stock length for the Cayenne.