What would an installer do to take care of this problem?They would use a mounting kit designed specifically to mount a DIN radio into a non-DIN hole. These mounting kits are made by several different companies and usually consist of carefully machined brackets with the screw holes positioned to match up with the factory mounting points. Part of the kit would also be a fascia plate to cover the extra gap between the DIN unit and the rest of the dashboard.
Would what ever he does hold up to the constant in-out motion of the box? would it be able to handle the jarring motion of the sleeve?Yes, if it was a properly-designed mounting kit. Most of these mounting kits were designed back in the "old days", when full-pullout radios were common. But ask your installer about it just to be sure.
Tony FabrisEmpeg #144