Most fixed blade installations are counter bored already for the prop bushings.
The A4A model has a .38" flange and bushings 74249-S and 74248-S.
Looking fwd at the flange with #1tdc at the 12 oclock position, going clockwise, the first 5 bushings are 74249-S and the last is 74248-S. Looking at the table below, their lengths are the same. Give catto a call and give em these dimensions.
