Old Micron Case standoffs

I have an old Micron ATX-T case. It has square holes for the standoffs. The standoffs were taken out along with the old hardware. Now for my question. Where can I buy standoffs for an old case like this, or does anyone have an ideas as to how I can make standoffs for it? I could cut, weld, drill and tap holes for standoffs. However I would like to put "OEM" style ones in if possible. Thanks for the help.