could also be tie rod ends/or wheel bearings. Thats my current problem is that it pulls to the right because it can't hold the allignment due to the tie rod.
the stock 175/70 r13 tire size will also amplify what is wrong. a wider tire will make it easier to drive. But it's harder on the tires. I shoved my 205/45 r16's on since I don't have the cash to fix it right now. with the stock rims and tires if I let go of the wheel the car would try to pull itseld into the ditch... with the ones I have on now I can let go and it will go straight