What you would likely need to do is go to your local hardware or specialty fastener supply store, like Fastenal or Grainger, someplace like that, and get some Allen or Torx headed chrome bolts that are the same thread size and pitch as the existing ones, but with longer threads, and then source some chrome, fiber or hard plastic washers (probably like four or five of them per bolt location, to slide over the additional exposed length of the new bolts between the front panel and the female threaded inserts that are part of the case body itself which would result in increasing the width of the gap between the panel and case.
Obviously you need to determine a length of bolt so that you can add four or five (Depending on how much you want to increase the gap) washers but still have like four or five threads extending beyond the washers so it can solidly be threaded and fastened to the chassis inserts. That would be the easiest and probably best aesthetic option.
What color is your case? White or black?