I have done the same thing mate ,busted the right one off.Mso or most bike shops don't sell them however there are a few options
1)run with out them depending if you ride in less rocky areas as all there there to do the covers is the protect your fork sliders for rocks and shit.
2)get in contact with ciniworx they sell the genuine carbon fibre slide covers for fastace forks wich fit your forks ,the price is $70 for 2 including postage remember thay are carbon fibre (there $29.99 each)
3)if you have ripped the bolts through the holes like i did you can fix it for free by taking a piece of sheet metal cutting it to the length of the fork cover bottoms where the holes are (width around 8cm) and cut the height of the piece of sheet to about 12 mm then drill two holes the same as the ones already there on the covers, apply some glue to the back of the sheet metal and clamp it making sure the metal has bent into the shape of the gaurd,the once that has dried with the clamps still on drill the sheet metal where you drilled the holes before (best done through the back of the gaurd )then pot rivet both of those drilled holes.Then drill the other pre existing bolt holes to the exact size!.file then so that no sharpe edges exist on the sheet metal.take the clamps of then give the sheeet metal a polish with a scotch gaurd pad to make it look nice ,sandpaper the edges of the sheet metal to make it smooth.File the pot rivits a tad at the back so the covers fit comfotably then put washers on the bolts and put the covers back on the forks.hopefully it had worked
let us know how ya went