Replacing GE w/Insinkerator?

My project for the day was to replace a GE garbage disposal, model GFC1000Y-02, with an Insinkerator Evolution Premier. If original to the house, which I’m guessing, the GE is about 18 years old. I was going to replace with another GE, but the local stores don’t carry that brand…of course.

Now that I have removed the GE disposal, I see that the mounting unit is totally different than the new one. I don’t have a clue how to remove the GE mount – or if it’s even possible to replace it with the Insinkerator mount.

Would you recommend returning the Insinkerator and buying a GE so I can keep the same mount? I see that my GE model has been replaced by model GFC720F. If not, how can I remove the GE mount?

Thanks for your help! I’m new to the home improvement game and was really excited about doing this.

I finally got the flange loose. It just took a lot of patience and elbow grease. Nothing is simple, though. Now electrical connections are too short for the new setup. Time to call a professional.