I ordered this for my 2011 CTS-V when my 90mm throttle body stopped working. I have a 102mm Snake Eater and ordered this adapter. You must order (4) M6-100 x 60mm socket head cap screws to use this adapter with the Snake Eater. The factory bolts and the bolts supplied with the adapter are too short, have a hex head and will not fit the throttle body. I'm not sure about Nick Williams.
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