Some models used a two piece bolt design, but it looks like they have reverted to a one piece. For aftermarket TI bolts, I'd be cautious about which to use. I would choose either Hill, Capristo or Novitec. Titanium is strong but brittle, you don't want to run a risk of production error or poor quality material.
Ya, and considering the price of a Hill set which is of a better quality, it is still way overpriced.
I have accounts with Capristo and Novitech so I can save someone some money on here - if anyone wants. And I also work with a Titanium factory that makes incredible parts who I could also have make these but you make valid points.
One more to add to the list, Ferrari 19" 458 challenge wheels (produced by Aptech and BBS) same part #s 19x9 fronts 16LBS 19x11 rears 18 LBS Image Unavailable, Please Login Image Unavailable, Please Login