Cali Tourings and the like had chrome mirrors I believe, in fact I think they were the same as my 1100 Griso so a 'Factory' option is available if you want to go that way but as stated the thread is pretty standard so a visit to the Bay of Fleas would probably turn something suitable up.
Oh yes. The factory ones are prone to loosening their lenses and 'Buzzing'. The late Todd Haven once remarked that when he was sitting in the storeroom at MPH on a quiet evening he could hear the damn things buzzing on the shelf!:D
Pete