Goodyear Wrangler Silent Armor problem

I checked with the dealer and with Goodyear direct. They have discontinued the tire and replaced it with something new. Never the less, they do not make any tire in the size that I need. I also purchased road hazard with the original purchase. Goodyear said the only option is to replace all 6 tires with the next size up. My GMC dealer stated if I go to the next size tire my computer will need to reprogrammed to assure the speedometer and ABS work properly. Why Goodyear would discontinue a tire without having a sized replacement is beyond me. All I know is that I'm stuck buying 6 new tires and Goodyear is not willing to warranty them. So much for Road Hazard and Warranty.