Nice to see other people improving the aerodynamics on a 96-00 civic.
I have a hatchback, and I also made a side mirror.
I kept the standard mounting plate for the mirror, I filled the gap with a gluegun with the screws in place so its removable and I can mount the oem one with ease.
Made also a aerodynamic cover.
Look at my topic, got some more pics if you need it.
http://ecomodder.com/forum/showthrea...ing-17354.html