Necro thread... looking at the 2022 shifter linkage the pin holding the washer (no change) has been changed to a ring clamp. Otherwise everything looks the same although not the same part numbers.
https://parts.subaru.com/a/Subaru_20...11-350-01.html
I might order this ring clamp and see if it works better than trying to find a slightly thicker washer. not sure how such a tiny ring clamp works is it just one piece that's stretched to fit on?