Looking for X07 ROMs for testing

Hi guys,

I trying to find some ROMs for testing the various formats for the next release of my emulator: http://javatari.org
The new version will add support for almost all formats.
But I'm having a hard time finding X07 roms. I found only one so far, but it is a conversion...

Can anyone point me to some X07 roms? Maybe original ones (those written for the format)?
Is there anyway I could get a Stella Stocking ROM for testing?

I also need more roms for the formats: UA, 0840, SB (SuperBanking) and EF.

Thank you very much,
Peccin