see all the trim around the radio, mainly the black part, where the vents are and mebe the ac controls. that all has to come off to access the oem h/u to pull pull hte few screw out of it.
and then your gonna have to cut the radio support out of the back of the opening, and get a proper kit for fit and finish..
BTW, what H/U you going with??
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Bill the locksmith
I have a volvo..