If you've ever removed this piece in your MKI MR2, you probably broke it. This plastic trim piece hides the door mirror mounting screws and is held in place by a push-tab that normally breaks off if you try to remove it.
Toyota has discontinued the left side triangle and rights are most likely limited to stock on hand, so we had them reproduced. This is a very exact reproduction that you will be hard pressed to tell apart from an OEM piece.
Buy both and save $6!