In the past there was no waterproofing which allowed moisture to get behind/underneath the tub., so if the tub is waterproofed and there is no requirement for access ie pump/ motor for a spa then u dont need to install the vent. However if you are not replacing anything apart from the vents, then yes I would advise them to stay. You can get ceramic vent tiles from tile companies.

Maybe contact some second hand/salvage yards. They may have old chrome vents.

Thanks @dreamer.

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Excellent, well done. Where did you end up getting them from?

Oh, I didnt articulate that well 🤦🏼‍♀️ I found them in a box right at the back of my storage unit! I had given up hope and am so relieved.

Perfect 🙂