On the stock drive cover you remove 6 allen bolts remove the cover , on the back side there is a 10mm bolt remove bolt the center piece will come out. There are 2 rubber gaskets leave in place put in new billet cover and secure with same 10mm bolt. Install whole assembly and install same 6 allen bolts. The yammi catalog which I have, has Billet drive pulley covers or Billet drive pulley case set. You have the cover and that is what I have, the differencein your cover is that the decortive allen bolts are loose, mine were installed. You may have a defective part. The cover should have been thread tapped for the allen bolts. Hope this helps imevh2