Do you have a picture of it apart just for inquisitiveness? Don't worry if you put it back together, the big ones look different to the single bridge. I hope I can do something with it.
Sorry I didn't realise 4-way SLI bridges weren't reversible, i've seen so many weird combinations for 3-way and 2-way I thought it didn't matter what the hell you did so long as they were all connected some how
JR