Had the same issue when I wanted to put the stock cdr-220 radio back in my car. I was able to get the replacement plugs from:
Becker Autosound
170 North 5th Street
Saddle Brook, NJ 07663
United States
201-773-0976
parts@beckerautosound.com
The part number was BAS-1253. Hope that helps.
That damaged knob is also easily repaired. You should be able to find that info quite easily by doing a search as the info has been provided a few times.