I've compared the fans from a KA-DE and the SR, and you can tell that where the metal ring is on the clutch fan itself, on the SR, it's kinda got like a negative offset on it, whereas the KA-DE fan has like a 0 offset.
Because of that offset, when you go to put the fans on, the fan will either just clear the crank pulley or hit the crank pulley.
However, I think 1 of the motor's clutch unit for the clutch fan sticks out further and 1 of them is shorter, I can't remember. In either case, I must have the one that sticks out further, because I can use either the KA or the SR fans on my SR and they both cleared my crank pulley.
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