Thank you all for your response. To Jon Mello, that's exactly what I have, I guess I'll have to break down the tire to get the inside dates. To Janobyte, even though our Z's were built 4 weeks apart, my DF's could have been from the last 'batch' of 07's and yours from the next 'batch' of rims produced. I believe your rims were the first batch to have the date stamped on the outside and the DF stamp facing 'inward'. I think I read some where that GM was putting out 600 Camaros a day???