FYI, I replaced mine with a brand new one just after i first bought my sidekick. Within a year the tabs on the back of it started to break again, the same problem that the old one had. I took a short self-tapping metal screw and put it right in thru the plastic and into the door, and i haven't had a problem since.
I was kinda frustrated at the time that the thing was starting to break after it hadn't been in there for long, but i think that my "fix" has worked really well, and i highly recommend it, if the rest of the lever is working ok.
(You'll end up with 2 screws holding it in place).