I've done both of mine. Left side about two years ago and right side last month. Left side was only leaking @ the rear. I Draw filed it flat., might be worth having it machined if you have a source. The right side was leaking @ the rear and the front. front lower bolt was broke. The right side was about an 1/8" warped. center looked good, front and rear were out. again I file them as flat as i could get and reinstalled. We'll see how it goes.