Chinook RV

I'm doing some interior updates, and the three drains (two kitchen sink, one bathroom sink) are in need of replacement. I found, and installed, the kitchen ones, as they were pretty easy to locate, but I'm having a hard time finding the tiny one for the bathroom. Any ideas as to where they sell them? They seem to be called "bar sink strainers". Here are the ones I got for the kitchen.

https://www.amazon.com/gp/product/B000D ... UTF8&psc=1

Do a Google search for RV Shower Drain, and many show up. Here is a sample: https://www.amazon.com/Valterra-A01-201 ... B00C5SIEQ2

I think FatBouy is looking for the build-in sink drain in the bathroom.

I would hate to have to work with the bathroom floor drain or the toilet. But the sink should be easy to do once you know where to buy the part. I usually go to a plumbing warehouse and show them the part, or take picture with a camera. Kind of surprise that it is different from a regular bar sink drain, however, but I did not pay enough attention to it yet.