Stewart, if you change your mirror type you may have to drill more holes as the hole centres vary and they have different bases and i believe the racing mirror is a single post, so dash off again….
Yes i thought that myself
what ive now done is taken apart my old Librands mirror that came off the windscreen by heating it up and prizing the glass off which was stuck with mirror glue, removed the old ball headed arm and swapped it for my new ball which fits on the stem that I've already fitted to the dash
really pleased as the old mirror was just the right size and looks nicer than the mirror head that I broke and has a neater and firmer adjustment
it wasn't easy as it was never designed to be taken apart but worth a hour of fiddling about
quite pleased i broke the other one now
2008 XXVII Platform, Bugatti Blue Roadster 4 Seater