So apart from getting them the size is an issue.
How is the bezel holding up currently?
The 2mm seems to be critical.
It looks like there is a small plastic surround. I think the 7.5mm and the 5mm will then fit. Both those are 2mm wide and that may just be the size of the ‘slot’.
One is very thin at 0.5mm with the other 2mm.
Either way I would probably hold them in with silicon rubber and there’s no way they would fall out. Double sided sticky tape is probably waht was used.