I believe I gave the correct part number as that is what I got when I ordered it. You also need to make sure that it is Revision 4.0 or it isn't the right one.I didn't notice it before ... but the mismatch might have been due to a slightly different part number.
Ignoring the Newegg pic (the MFG part # is right)... i'm staring at the part I linked to and it looks like it would have fit perfectly to that bracket.
RSC-RR1U-E8 ... will post a close-up pic of what I have if interested.
I found the part number for the riser card! It is a RSC-RR1U-E8