Originally Posted by umnitza

Thank you for your interest. We simply don't give out the exact measurements of those rings due to several factors.
Normally:
8X is for Xenon cars - LCI and pre-LCI
9X is for non-xenon cars pre-LCI
and 8 or 9 is for LCI halogen cars - depending on the overall request from the customer.

We also account for individual customer requests different than our internal sizing.