You should have received a small pouch in the bag with 4 rubber spacers, two inserts and the nuts, washers and bolts required to mount it up. If they weren't in your package I'd be giving FMF a call. Now that said the mounting hardware FMF supplies leaves a lot to be desired. You could likely do better if you stopped by the local hardware store and picked up two rubber grommets, a couple short lengths of tubing to fit the inside of the grommets, 4 washers, 2 nuts and 2 bolts. Have a look at an 89 to 94 KDX200s mounting system and you'll see exactly what I'm talking about.
David