Metra Electronics 95-2009 Installation Instructions Manual page 23

5. Toyota Matrix/Pontiac Vibe
Cut the highlighted tabs. (Figure E)
Cut (4) tabs highlighted on DDIN trim plate. (Figure F)
(Figure E)
Tab Instructions 95-2009
Tab Instructions
(Figure F)
6. Cadillac Eldorado/Seville
Cut the highlighted tabs on the DDIN brackets. (Figure G)
Cut (1) tab highlighted on top left corner of DDIN trim plate. (Figure H)
Continue to kit assembly
(Figure G)
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(Figure H)