Wow those are nice. I have 15" Centerline Legend Series Champ 506 2 piece Rotary Forged T6061 Billet Aluminum wheels on my car now. I would love to upgrade to 16" wheels. I have the Grand Am Brake upgrade now but these would allow for the Corvette brakes.
I believre 15" wheels . the picture shows the tape all the way out ot the outer side of rim. deduct the wheel lip and they are 15"
They are 16". I measured a 16" wheel in the basement and is was 17 1/4" outer lip to outer lip. The ones in the ebay ad are also at or over 17" outer lip to outer lip.
Preliminary measurements look like the rears stick out a little further than the stock 15x7 but aren't made for a wide body. The front are 16x7 and rear 16x8. I've decided to go a different route so if anyone wants them let me know.