Thanks but no need. I just heard back from Wilwood and the OD is 5.96". About .09 too big to fit the LS1 rotors.I can get into mine tonight if you want PM me about 7 to remind me, I just have to pull the caliper off so I can pull the rotor off.
Seems like depending on who you get at wilwood they either read off the website and tell you what you already know or will get your info and give you a call back with an answer.
I have to weigh my options now.
I'm reluctant to try and have another set of stock G-Body rotors cut down into hubs.