10 mm X 1.25 mm threads
2" Silver/Aluminum Mirror Extenders shown above and the black anodized aluminum ones shown below.
These extenders can be used to either raise the mirrors up 2" or extend them to the sides on most of the Suzuki models.
PS. The windshield on the DRZ400S above is OEM BMW from a 1998 BMW GS1100. The one below is a Givi aftermarket windshield also for the GS1100. The Givi screen can be ordered from http://www.happy-trail.com

2" Black Mirror extenders shown above on an 2006 DRZ400S

2" Black Mirror Extenders shown above on an 05 SV650 (Naked)

2" Aluminum color Mirror Extenders shown above on an 07 Triumph Bonneville

*Riders have put them on a Ducati 750 Monster, an 04 Triumph Thunderbird, 06 Triumph Bonneville and another on a 03 LiFan 125 Scooter. They also can be used on the 1984 Honda CB700SC Nighthawk to raise the mirrors so the arms can be bent farther to the side without cramping the space between the mirror and the grips. 

They will not work for the FZ1, but will work on the custom "majestic" mirrors I bought from Arizonamotorsports.com, and these mirrors have 10 mm -125 thread. Actually your webpage is listed on http://www.yamahafz1oa.com message board, and your extensions worked fine for a couple guys.
Thanks,
Tomas

Norm, 
Extenders mount to my MT-07. Looks great. Will work on MT-09. Most likely MT-10 also. Attached is a picture of extenders on my bike.

Hi Norm
Yamaha sells the MT-07 globally, but in the states it is called FZ-07. In 2018 Yamaha changed the FZ-07 to MT-07 in the states so that the motorcycle has the same name worldwide. All FZ-07 & FZ-09 , MT-07 & 09 will use the same thread for the mirror. I will mount Sunday and confirm fit. I had threads checked at my work, Pelco Tool & Mold, so l know mirror is 10mm - 1.25
Greg
 
 

These extenders can also be used on the Standard Suzuki Bandit models. see SilverBandit thread dated 1/5/03 at:
http://pub12.ezboard.com/fbanditalleybbsfrm19.showMessage?topicID=310.topic