I just got a pair of hybrids and they were complete with all the screws and hinge pins (been warned hinge pins are soft) to install skids, put the hybrids cases together and a few extra.
The flm extended chassis had an antenna mount, batt straps, two pieces for the steering posts and enough screws to install the chassis braces. Nothing for mounting the bulks or towers.
I would get a screw kit - especially if what you're converting has the orig OEM screws. I hate the OEM screws and the 1st thing I do when I get a new rc is to replace all screws with alloy steel hex heads. I've been buying kits from Tony -
http://www.tonysscrews.com/main.sc
Don't buy stainless ones, they are weaker and the heads will round out after you've used them a few times.