Specify new OE parts like this M8 Cap
Nut and know that they will fit exactly like the originals, will look exactly like the originals (when they were new at least) and will last like the originals.
In fact, we cannot think of any reason to buy any other type, especially some of the dubious pattern parts available.
Other Blind nuts of the same specification:
904431070000
904431070001
With a captive washer. this Cap Nut, sometimes known as a blind Nut, is specific to the application. Great value, superb quality. An OE part, what else! Order all the fasteners you require in one shipment, and perhaps a few spares for use in the future.