There were two different revisions to the inner bezel.
The first used metal spring clips which were pretty much impossible to remove and re-use (they either broker or they broke the plastic tab they attach to on the bezel).... but they sure were secure. As far as I know you cannot purchase replacement clips and Toyota only sells the second revision bezels now (they're pretty inexpensive though).
The later revision just has plastic hooks molded in which function to grab where the former metal ones did... They hold fine until you've taken them off a couple times then the hook may start rounding off and the bezel may occasionally pop off when you close the door.
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