I don't have a single voltage adapter, unfortunately. When working with 5v systems and 3.3v chips you have two choices - either stick the chip in and it will work (but supposedly not last as long as it normally would) provided you have a decent-build-quality chip (I did this for a few months while I located the other option), or you can locate an upgrade chip or voltage adapter. I opted to find an upgrade chip, both for uniqueness and because voltage adapters are oddly hard to find.
I ended up upgrading to a Pentium Overdrive from it, but I used an Am5x86 in an Evergreen 586 package upgrade chip for quite a while in my main 486 box (the Presario 425).