It is possible to use some washer for the three holes at the top I'd guess. But there are two tabs on the factory backing plate, one at the bottom of each large gauge where the plastic bezel is bypassed, there seems to be no provision for that on the photo. Maybe they are early "engineering" pics and the final ones will have the tabs, wouldn;t bee too hard to add the material to the die cutter and have them bent about 40 degrees towards the back. The 6th screw goes therough the front of the bezel on the bottom left, this one probably does not need a metal backing, as long as the other 5 have them.