The angle adapter is either for a Quadra/Centris 610, 660av, or a PM6100. They are all different.
The photo is too poor to make out what is what. So, I will ask: Is that a DAV slot there at the long end of the adapter (at the right) or is it a chip? It it's a slot, then it's the fabled 660av card and you may just have made Bunson's day. He's been looking for one.