Nitto 275 60r15 measurements?

Anyone know the height and width of a Nitto NT555 on an 8" rim? It's time for new tires on the back of my Duster, as the ones it came with are 17 year old Grand Ams. Yep, straight into the dumpster. They measure out at 27.5" x 11", and they fit well enough (especially with new springs that haven't settled yet). Wish I had 4.5" backspace instead of 4", but it is what it is. TIA.