Here we have a listing for the hard to find extra fine pitch dome nuts.   They are M14 x 1.25 pitch. They take an 18mm spanner (18mm a/f) Please use some copper slip (to ensure they do not seize up in the future is always a good idea). If they fit your vehicle can you please message me and let me know what model.  If they don't fit just let me know and I will refund. Thanks for looking!