Early Aurelia fasteners, used for interior trim work, are quite difficult to source. There are a surprising number of them. Using the correct ones separates a proper restoration from the others.
William Corke has put together a list of those used in the B10, likely similar to the ones used for other Aurelias (early B20s, possibly B12). While some of the sources are likely out of date, the information is worthwhile and detailed. His spreadsheet can be found at the bottom of this page: Parts