F3 the length C = 290mm the bottom shock mount is the same as nsr's but the top mount needs about 2mm removing from the width. I just took one out of my mc18 and replaced it with the standard one. Found it too stiff, couldnt get any static sag! Was going to put the nsr spring in the cbr body, but no bike shops where i live in the sticks had a proper spring compressor!
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it wouldn't be fun if it was easy!