Sink Drain assembly corroded

My galley sink and my cockpit sink are both in good shape with the exception of the drain. It is corroding and just doesn't look good. Simple enough to replace but i cant seem to find one to fit the cockpit sink. The flange on it is 2 in and it looks like it goes down to a 1 3/8 drain. Has anyone ever replaced their sink drains? If so where did you find the replacements?
Thanks and before anyone says it yes i checked GLS, Amazon, Google...
Thanks and before anyone says it yes i checked GLS, Amazon, Google...
It's 5 O'Clock Somewhere!
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https://www.defender.com/category.jsp?id=2234213&path=-1%7C51
2018 Cherokee 39RL Land Yacht (Sorry...)