I just installed these on my 2015 STi and they appear to be well made and fit the hubs very securely. The reason I don't give the spacers 5 stars is that the bolts used in the spacers are a few millimeters longer than the stock bolts. This resulted in new nuts having to be purchased as the standard nuts are too short. Note that the lock nut supplied by your dealer is also likely to be too short. This led to a few hours of frustration as the bolt pushed out the center of the locknut and I learned how to remove the locknuts without a wrench. Turns out it's not that hard and I won't waste money on plain locknuts anymore.