how do I get this flange out

I got everything off, two chain sprockets and collar.

I was wondering if I have to take off the thick backer plate?  remove the roller? 

 

 

local dealer just said take the bearing out and cross reference it to a general bearing supplier 

 

 

Those screwdriver marks in the bearing seals aren't from me, dunno why someone would do that to those seals and thin metal to keep the seals from pooching out 

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how do I get this flange out