my 87 300d alarm goes off when I unlock from drivers side. The outside of lock cylinder l;ooks like mayde someone tried to get in, chrome piece missing. Trying to remove outside door handle, unable to get it out. I removed the allen screw so it is loose. I found broken plastic piece in bottom of the door. What piece works the alarm switch? can lock cylinder be purchased seperate. I am going to check today with dealer. dfcar@hotmail.com Thanks