hXc95SLS

I recently had took the fuel rail off of my LS6 CTS-V. Upon removal, three of the small plastic o ring retainers on the manifold side of the injector cracked or broke completely. After a quick internet search for new o ring kits (which I needed anyway) I ordered up 8 BWD part number 274081. It seemed to be exactly what I needed. Upon opening up the first kit and installing the new o rings, I went to put the plastic retainer on and it doesn't fit. It's too big and just slides right overt the bevel on the bottom of the injector. I went back and read quickly. The kit describes it as a spacer, not a retainer. What am I doing wrong here? Please help!!!!