Are the 15" X 6" & 7" rims the same on both of these cars. Cause I see all these being offered, along with trim rings by Corvette guys. And the trim rings are not notched for the valve stem at the bottom they are closed in, like the SEVEN inch Camaro trim rings. I email the seller and mention this to them and they tell me they are for sure 15" X 6". All the six inch ones I have seen for sale, and even the one at heartbeat has an open bottom for the stem. And they are described six inch. What's the deal, are these rims and rings configured differently? ... Danny