I actually bolted mine up to a F34 2022 fine. It seems to fit solidly. Don't know if it fits the stepcast yet. TRight, 2022 F34 (the fork in question here) needs the part (that is not yet available). No timeline on that yet it seems.
he F34 SC and F34 2022 both look similar but for some reason Synchros doesn't list the new fender as compatible with both.