Those are for everyone to set their drinks while they check out your awesome Griz on trail breaks!:wink2:
Get the Yamaha rear box. The Yamaha rear and front boxes for 2016+ Grizzly are custom made for the Grizzly with the rack recessed into channels built into the bottom of the boxes. There are no U-bolts sticking up from the bottom of the boxes ready to impale your cargo. The heads of the bolts are recessed into plastic at the bottom of the box. The screw ends of the bolts go into the rack. Take your 2016 Grizzly to the dealer and sit the box on the rear rack. You will be sold. I have been very happy with it.
The Yamaha front box may interfere with the 3rd headlight. I am interested in hearing from people who have the front box about this possible problem. I don't ride much at night but when stuck out on the trail, I appreciate all the light my 2016 Grizzly throws out. (My popo friends are a bit jealous.)