Transparent side panel for OptiPlex 7040

I have a OptiPlex 7040 Mini Tower PC and I've been looking for a transparent side panel for it. Any ideas on how I can get one? I cant find any on the internet at the moment. And, No i can't take a picture of the side panel for reference because I have a lot of trouble taking it off and putting it back on. (ill only do it when/if i get a transparent side panel)