Most common tire size on 97 528i

My 97 528 in riding on tires sized 225/55/R16 tires. The inside of my wheels are stamped 7Kx16. The manual states that the tire specification for
this is exactly what is on the wheels; 225/55/R16.
When I research tires I find that there seem to many more 225/60/16 tires available than 225/55/16. A local BMW mechanic is adamant that 225/60/16 are what is supposed to be on this car.
I suppose the wheels could have been swapped, however they are BMW wheels and seem to be about the correct age ( base on what I think the wear should be ). This wheel is aluminum and has 20 ribs in it.
What do you think? Was this wheel common on a 97 528? Could my car originally have come with tires sized 225/60?
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