yes you need the spacer, same era Gen-2 subaru. I understand your find, a car I purchased came with a odd length spacer, so couldn't put cotter pin in as nut wouldn't thread in far enough... wrong spacer.. so assure same general era of car.
some can be stinkers to pull through. A smear of grease on bearing surface etc..
I would look at the axle.. possibly dimension another at the parts store.
I looked at going to those sealed bearings (used in Electric motors). I was assured the 6207 was the critical number, the rest.. blahh, blahh, was more factory rating, speed, etc.. so everything you described should work.
Do a "search" on that topic from task bar above regarding pulling them through. Everyone has their own way that works for them. I prefer several large washers as stacking spacers, (assure I.D. of washer is larger the O.D of axle and O.D of washer rests on hub), I use shaft collars like you would get from farm supply store just a tad smaller o.d. than the bearing to tap bearings in and use as spacers and axle nut and washers to pull axle through. Normally that first section should be easy enough to get the shaft end just past the hub to get one washer and castle nut on shaft end and tighten to begin the process... and repeat stacking washers/spacers and tightening nut to suck it through.
sorry not much help but it should be working for you?
Edited by Indrid cold, 02 May 2013 - 12:11 AM.