The one in the auction doesn't have the cache daughterboard or a Nubus backplate. I own one of these, but mine is defective (likely a bad voltage regulator). Mine has the cache daughterboard and Nubus backplate however.
Very interesting, any chance you could post pics? I'm very curious to see what a NuBus backplate might do.
Here is a link to a photo of my card:
http://i1262.photobucket.com/albums/ii607/SpawnedFromTheEther/Daystar%20PowerPro%2080MHz.jpgAll I meant was that it has the proper metal alignment plate mounted that centers it in the rear slot opening. Note the cache card present.
I replaced the garbage plastic heatsink retention pins/springs (three of which broke) with nuts and bolts. I used insulating washers on the back and had to move one capacitor slightly. The fan bracket is not mounted in my photo, but I do have it. The fan had also failed and been replaced. There is a jumper near the back of the card which can be used to disable the card during boot. During testing I actually attached a switch with a length of wire so it was easier to change modes. If I ever manage to repair this card I would permanently mount a switch by drilling a hole through the Nubus backplate. I'm awaiting a shipment of LT1085 voltage regulators from eBay so I can see if it is the existing regulator that has failed. This won't be an easy replacement since the entire back of the regulator is soldered to the board.