This has been my temporary solution to the problem. I bought some grommets from Aliexpress:
Black grommet with a 7.5 outer diam and a 5mm inner diam. You will 18 so buy a pack of 20.
I bought 1.5mm thick plastic builders shims. Dimensions 14mmx12mm with an 8mm central hole. A few of them needed cutting down smaller to fit certain constrains. Use a heavy pair of scissors with a grated edge.
This has held the speaker grill on. I am sure if I took the speaker grill of some of them will fall out. I have therefore left it in place with a view of not taking it off whilst I try and source some better fitting grommets.
I have attached some pictures.
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