i would think the shifter in the sf is taller than the impreza one. kb shirt throw shifters, part #s are different between both. i opted for the sg shifter (over the impreza one) for my sf.
AFAIK fitment is identical (prior to 09, at least) on all 5-speed Foresters and Imprezas (lengths differ though, but between SF ans SG you should have no problem). But that's only the shifter stick itself - some of the mounting hardware and trim are different.
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