I did not have to purchase any. I already had mine.
Check post #33 on this thread,
CR Headlights might help.
I checked and doing a search on the SLC web site comes up with "nothing found". You might want to call them and see if they can cross referance the part numbers.
Also, here is a link to the Advanced Tech Corp / KD Lamp web site
ATC
Hope all of this helps. FYI, my chrome ring/bezel measured 8 5/8 dia on the outside.