2000 civic ex DIN kit
 

I'm looking to upgrade my headunit from the stock one in now. I know I'll need a wiring harness, but my question is about the DIN kit. The stock radio in the car looks like it's in a single DIN plastic piece already. All the single DIN pieces that I've installed in the past look almost exactly the same as the one my stock radio sits in. This leads me to my question...Is it actually a single DIN piece that will fit any head unit or is it specifically designed for my stock head unit? I'll try to get a picture up as soon as I can