I am thinking to buy and install feed side skirt on my fd.
I have already install mazda original spoiler about 5 years ago.
Is possible to install feed skirt with oem spoiler or I have to remove them first?
Any pics with feed side skirt and oem mazda spoiler ?

 

Are you sure you're asking what you mean to be asking?
If you can put a part on the side of your car on the bottom while also retaining a part attached to the deck lid? If so, yeah sure. You can do that. What's stopping you?
If you're calling the OEM rubber skirts, "side spoilers" or something (which would be odd considering you made a fairly clear distinction of terms), That'd be a bit strange but, you could probably get them to work. The attachment points would require punching more holes through the bottom of the rubber, afaik. People have put the the FEED skirts under a few other more rigid skirts, but I dont recall seeing them under the OEM rubber ones.
You'll be among the first!