Looks like it fit just right! Wasn't familiar with the Holden Calais V (I did look it up, though...in the US the body style is sold under the Buick brand so handy for folks with that car over here). And maybe it's different there but installing a radio shouldn't void the warranty...first thing I did when I bought my truck was schedule an appointment at the radio shop to get the roof drilled and antennas mounted and then put in a radio console and radios. But anyway, looks good. What antenna(s) are you running with it?