Yes actually I do have specs. These are the tires here, I could get more exact but I'd have to dig through about two months of emails back and forth with the shop I'm getting them from. A Tire Discount in Dayton, OH. Down the street from Dayton Wire Wheel. I started with 18x8's and 20.9.5 but moved to 20x8's and 20x10's in the end.
front-245/45R20 99W (Nitto model & stock number: INVO / 203-140)
rear-275/40R20 106W (Nitto model & stock number: INVO / 203-180)
The Invo's are considered a Luxery Sport High Performance an they have execellent wet/dry performance as well as good road noise levels. There line up is here: www.nittotire.com
You can also find a dealer near you through this site too. The website say they only have ZR's but the dealer told me they have R's as well in my size. You may find a bit off because we didn't dicker over the exact sizing as I already have wheels selected and they really need to fit that so I put them with a Gary over at Dayton Wire Wheel and there getting the final particulars straightened out. Usually the best choice.
An you just reminded me to shoot them another message too
. Thanks. Hope this was helpful.