Left and right lowers are different, and not interchangeable, if your forks are bent it'll be the stanchions, probably about £100 new each, could quite easily buy just one and if not confident take the fork down to a mechanic,
 if you buy second hand off eBay chances are high they could be slightly bent too!
I just swapped my whole front end today apart from the wheel with a thundercat front end as my forks weren't just bent but one was proper 'creased' at the yoke.
Why the thundercat swap?- my T'cat got cat B written off in my last accident, frame bent, front end was fine so instead of spending money it just took me time to fix my wobble!