You might be able to install a PEM. They make them for many different gauges of metal and there are many different styles of PEMs. I would guess any sheet metal place would be able to install them for you for a six pack or two.
About Markbass...nice stuff but their CS
sucks, When I need to replace any of the MB stuff I own, I will be buying something else. I have a MB 500watt Big Bang amp and I bought it not working with the commensurate price. I figured I could get a schematic and fix it myself (I am an amp tech) but nope, They would
not send me a schematic. I have
never had a company not send me a schematic for a piece I was working on. I was able it fix it after a fashion but not with any help from them.
EDIT: I forgot to post a link to the PEMs
Browse PEM® Brand Fasteners for Metal Sheets and Panels in the PennEngineering (PEM) catalog including Nuts for Sheet Metal,Studs and Pins for Sheet Metal,Standoffs for Sheet Metal,Captive Panel Screws and Hardware,Sheet-to-Sheet Attachment,Cable Tie
catalog.pemnet.com