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pic of my f2 uk model indicator
Found the large type adapters for the front indicators, they are female type, whereas the 550F2 has male type indicator mounts so to use them you'd need to change the fork ears as well. The brackets you want are 33607-390-600, very rare these days. Only fitted to UK, European Direct and French 550F2s. CMS have 1 in stock at £58 or so. Also 1 at Honda4parts.nl .DS also has 1 in stock. There are some male large type indicator stems for the front, 90154-404-610, just found a pair on the web.
is it just the larger indicators you need or the mounting bracket, the one on the pic looks like the large one and would not fit the indicator shown on the pic.