Hi again, Pedro.

Thanks so much for your help on this.
Okay. I've ordered different tires for the rear. I don't know if they're going to make a difference. I need to backup here: I got these Kumhos from my mechanic (very well known Vette mechanic in the Twin Cities) - they have less than 100 miles on them... he had them on one of his Vettes he just sold. I was out of town and brought the car in to have some minor stuff taken care of and he noticed the wear bars were showing on my run flats. He knew I didn't want to spend a gob of money on tires just now - and he knew I was considering putting the 18" rims all the way around. He had these rims he had taken off another Vette of his, sooo he was kind enough to put the American Racing rims (Casino-style) on the car with the Kumhos he had taken off his car. He sold them to me for $1,200, all inclusive. I love the rims. I love the tires... but they're the wrong size, clearly. They are all 275/35/18's. (I had people POINT at the car today - you know they were goin', "Whoa! Look at the rear! Those tires are smaller!" They aren't, but appear to be.) If I start from scratch, replacing all 4 tires, it's going to be spendy! I already paid him for the wrong-sized tires. So my questions are these:
1. Will switching the rears to 275/40/18's fill the gap? I could justify the price of 2 tires, but not 4.
2. If not, will lowering just the rear, in combination with the 275/40/18's, fill the gap and not look odd?
3. Is the lowering of the rear end something my mechanic can do? If not, where would I bring it?
Thank you, thank you, thank you for your guidance.
Mary
(P.S. No pics yet - I'm waiting for some greenery for backdrop.

I'd love to see yours. )