In dash speaker

I bought a replacement dash speaker for my 73 Dart. Like most "replacement" parts, it doesn't look quite like the original. Has anyone replaced their dash speaker? I have no idea how to get the old magnet out of the frame so I can use the old speaker frame. It looks like its epoxied in or something. Any ideas would be appreciated.

20161211_121113 - Copy.jpg

20161211_121347.jpg

20161211_121354 - Copy.jpg