found a picture.. number 13 and 14 are floating cone lugnuts for that very application....
they are available from that retailer in M12x1.25 and M12x1.5 ánd they cost 53.SEK each which is about 7,50 USD EACH! (150 for a set) but they arent rocket science to recreate on a lathe.... and like i said, ive done 20K without.....