It's a known issue. I had sized the bolts to be long enough to fit with the AMD reference mounting back-plate design, not realising that various motherboard manufacturers were supplying mounting back-plates that did not follow the reference mounting back-plate design. The AMD reference back-plate design is meant to have bolt "wells" that poke up 8mm (5/16") up from the surface of the board, which would normally give about 5mm of thread for the supplied bolts to bite into.
Presently you have two options:
1) Email me, and I will mail you some 6-32 x 2" long bolts (free), along with some washers. Put 5-6 washers on each bolt, and screw the longer bolts through the black mounting bracket and into the DFI mounting back-plate. The washers are needed because the 2" long bolts are now "too long" and can hit the ATX case back-plate behind the motherboard.
2) Go to home depot and pick up some 6-32 x 2" long bolts, and use the washers from 4-bolt mounting kit to stand the bolts off enough and bolt them through the black mounting bracket and into the DFI back-plate.
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