Button Rubber Pad for PaPiRus Zero

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Dear Sir/Madam,
This is Sergio Fernandez from ES.
Im looking for products with the following specifications :
The PaPiRus Zero has 5 switches that you can click. I attached a photo.
I am designing an enclosure where the PaPiRus Zero is included and I would like to know if you can offer me Button Rubber Pads (like the ones on the TV Remotes, dont mind).
The space between the 5 switches is exactly 9mm. And the buttons should be small enough to fit correctly (Because the screen and the buttons are very close, so they have to be horizontally-aligned).
It also needs to have some type of support so we can insert it in the enclosure, in order for it to not to fall. We are designing the CAD file so we can talk about this feature more.
If the project goes on maybe we could order even more than 100. But first, I would like to try some samples.
Thank you.