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.
Do you have a pic you can share looking at the backside where the fender bolts on? All the new generation Fox forks share the new rounded support arch which is distinctly different than the angular, trapezoidal arch of the previous generation forks. Just curious how well it actually lines up and if there are any small interference or overlap issues.I actually bolted mine up to a F34 2022 fine. It seems to fit solidly. Don't know if it fits the stepcast yet. T
he F34 SC and F34 2022 both look similar but for some reason Synchros doesn't list the new fender as compatible with both.
After looking at my Stepcast / cramming in the RRP proguard fender I don't think this one will work for a step cast. It seems to rigid / designed to match the width of the F34 crown (not SC). Bolt holes should line up, so you may be able to get it to work with trimming.