I my unit started to leak from the ceiling last night. After doing some poking around I found the culprit is a rusted overflow drain pan. The pan is roughly 24x48x3 in size. My question were would I find a replacement. Would the big boxes carry it or do I need to go to a A/C supply house or have it fabricated by a sheet metal shop. I have also heard that you can also get a fiberglass pan instead of sheetmetal. I thought this would be a standard item but it seems I am incorrect. Could somebody put me on track as to were to secure a replacement pan. Thanks in advance.