Hello my name is Mike and thanks for using Just Answer. Here is a link to a website that sells the parts for your brand of garbage disposal. You should be able to find what you need and order it from there. I hope this answer was helpful in dealing with your issue. If so, please remember to click the ACCEPT this answer button. Thanks.
Mike W
Do you need the metal ring that says Waste King on it? I don't think that they offer the black. I wasn't sure if you needed that piece or the black rubber insert. Here is a link to their site and their authorized internet dealers. Hope this is more helpful to you. I don't think you will find the black that you are looking for in this brand. Also, I'm not sure if you can get a flange from a different brand and get it to fit. That would be a trial and error process unless you have a professional come to try and make that determination for you. Even then he may need to just try to make it work. If this answer was helpful to you please remember to click the ACCEPT this answer button. Thanks again.
Mike W.
General C&ontractor
20 years exposure to the Home Improvement industry.