FYI, Michelin now has the exact original tire size for MYP: 255/35-21 and 275/35-21. Seems like they are designed specifically for MYP, not only the sizing and load rating, but also the acoustic design (foam lining inside the tire to reduce noise), similar to the original tires. In CA, you can order them from American Tire Depot or America's Tires. On the latter, you have to call, as they are not yet listed on the website. You can also order them from Discount Tires, also have to call the stores. It took about a week to get the tires after ordering in CA (supposedly shipped from Texas). The tires are made in Mexico.
In any case, I just got mine installed 2 days ago. Compared to the OEM summer tires, these drive softer and slightly quieter, but not as precise or stable at high speed cornering. That said, they are good enough I'll personally keep them all year round.