And IIRC, the Firestones are the narrowest of the group.
I would have only one reservation about the Firestones. A couple of years ago, my wife's Jaguar needed tires. I had heard a lot of positive comments about the SZ50, so I considered it to be on the "short list". I shopped around, and the best price in her size tires came from one of the better known mail order tire retailers. It was on the Firestone SZ50, and they were "on special".
I asked the sales rep if they were specially priced because they were being discontinued. My wife's Jag is a limited use car, and I didn't want to buy a close-out, in case she caught some debris and ruined a tire, and then I couldn't get a replacement. "Oh, no sir" was the reply I got, so I bought 4 of them. A month later, after I had them on the car, I see they're discontinued...
Anyway, to get to my point, the SZ50 in the Corvette run-flat sizes are the only ones left in that entire line, as they replaced it with the "Wide Oval". Maybe my concern is overly cautious, maybe not....