That is probably the only way they sell it as a whole you can just pop the new door off and put on your scanner, uniden should be able to get that part to you. Keep in mind it will be the entire door assembly but the door hinge pops in and out easily.No. That is the entire card holder, and the door on will only work if that particular model is the one Uniden chose as their OEM part for the scanner. You can try it if you want, but prepare to be disappointed.
There's also the issue of removing the door from the new card holder, and installing it in the scanner. It's a small part in a cramped location and is going to require some above-average manual dexterity to install, even if it is the right part.