4-Way Emergency Flasher Knob - 1968 Camaro

[gwp4]

Hi First Gen Camaro Experts:

I'm having some trouble installing a chrome emergency 4-way flasher pull knob (GM 398165) (first photo), which I believe is factory correct for a standard model base 327/210 1968 Camaro coupe. However, I've attached another photo (second one) of a black knob.  Did GM use the chrome knob on Z28, SS, RS models and the black one on base model Camaros?  Also, the chrome knob has a screw on the end (see third photo) and my original steering column also has a screw coming out from the column (see fourth photo).  I'm not sure exactly how the knob is installed on the steering column.  Should one of the screws be removed?  Greatly appreciate any assistance.  gwp4

[bertfam]

You have remnants of an old knob in there! You have to unscrew that threaded part and install the new knob.

The black knob was a 70's (and a service) use.

Ed