I have 4 Michelin Pilot Sport A/S 3+ 215/45ZR18 on my car right now. Today my tire indicator came on and my front passenger tire has a bulge in the side wall. Current tires have around 16-18k miles on them. I cannot find this tire in production anywhere. Am I looking at having to replace all 4 with a new model? If so, any recommendations?

 

I've got four of the Michelin pilot sport AS3 pluses two with 15,000 miles and two with 20,000 miles for sale no patches/ no plugs/ no bulges off my 2017 3 GT.
If your interested let me know. I'm in New Jersey. All four in excellent shape and no funny wear patterns.