Does anyone still make a ZII version?
With an adapter would it work with an A500, if it were configured to work in ZII mode?
No, nobody currently makes a ZII RAM board AFAIK.
And judging by the description on the original page, looks like this is strictly going to be a ZIII card. If you want more RAM in your A500, seek out the 4mb trapdoor/Gary solution that pops up on eBay once in a while. AdRAM 540 or something like that...