Replace lead with pvc

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I am going to be redoing my bathroom and currently the toilet is on shims I’m assuming because the flange is too tall. I want to replace the flange when I do flooring but I found it is lead underneath. I was wanting to cut it at the brass and use a no hub coupling to convert to the pvc. The OD of the brass is 4.25 and I read most recommend a 4x3 closet bend for toilets. Is a 4x4 closet bend a thing and recommended or should I reduce to 3” and use the 4x3 closet bend. Open to all constructive critism. Was hoping to not bother the cast iron hub and use a donut unless that’s the absolute best plan. Don’t wanna open a bigger can of worms. But all help is appreciated


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