OP's profile says he has a 2001, so both WRX and STi steering racks will need modification to fit.
We're in the same situation of having to replace the rack in our '98 and are planning on getting it rebuilt close to STi specs (rebuilder is taking out a full rotation). It's seems easier than trying to jerry-rig an STi or WRX rack to fit the SF5 chassis.
Also check out this thread: http://www.subaruforester.org/vbulletin/f70/will-sti-wrx-steering-rack-fit-2001-sf5-15975/
We're in the same situation of having to replace the rack in our '98 and are planning on getting it rebuilt close to STi specs (rebuilder is taking out a full rotation). It's seems easier than trying to jerry-rig an STi or WRX rack to fit the SF5 chassis.
Also check out this thread: http://www.subaruforester.org/vbulletin/f70/will-sti-wrx-steering-rack-fit-2001-sf5-15975/