I hadn't done a car radio installation in a long time so I was confused by the sleeve as well, plus the sleeve didn't seem to fit properly in my situation. So I just bolted the 700IDT directly to the mounting brackets and didn't use the sleeve. Just make sure your screws aren't very long so they don't impede the sliding process.
Are you talking about the plastic front bezel? It just pops off IIRC. I was trying to recess the unit as far as possible into my dash and the bezel wouldn't fit without trimming a lot of it off. So I just went without it and made an aluminum front panel to cover the lower hole. I actually mounted a status LED and 2 USB ports to the home made front panel as well. Figured I'd use the space for something.
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Carputer progress:
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Zotac N630I-D-E M/B w/ Nvidia 7100, Celeron 430 1.8 GHz, Xenarc 700IDT, M2-ATX, RR & DFX 4.0.
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