My wife and I both have 2018 Imprezas. However, we purchased mine in february and her's in August. Mine has a build date of 11-17 and still has the small strut caps with bonus rust feature upgrade. Hers has the larger strut caps, but don't be fooled, her's still has some rust. NOT anywhere close to mine, but it's present, and still collets a little bit of water. I've ordered the new dust seals for mine and will be doing the full treatment on both Imprezas. This is not an issue you can ignore even if you have the larger dust seals.