thanks a lot benalishhero!!
you are correct cap'n.
the min thickness is 27.4mm and for around $50 a pop i would not turn them. i just wanted to estimate how much wear they had on them, since i meassured 28.7mm i didn't know how used/old they are (it's a 2004 with only 13k mls).
they work just fine, no problems at all.
and another round of
- hey, it's friday!!