Professional or shade tree, I don’t care. I’m on the final stretch of this overly long bathroom remodel, and need to throw the toilet in. Went to put my new flange in, and it doesn’t fit. Looks like the OD of my existing plumbing is 3”. I didn’t see a flange that would work at lowes/Home Depot. Suggestions?? Is there a part somewhere that I can use to make this work?