bar mounted mirror Q

[tommyteeman]

going to put a set of bar mounted mirrors on and was wondering what others have done. The right hand looks simple enough using the mount already there, is that reverse thread in there ?
Left side was thinking one of these http://www.ebay.co.uk/itm/Bike-Universal...4849c59408 which I assume will be normal/right hand thread.
Now then.....If I buy a set of yamaha mirrors will they both be left hand thread, both right hand or one of each ?  :'( :lol

any help welcome........