right heres how it works. what ya need to remember is that its a drop plate, not a shock mount - you still use the original mount. the short studs that are welded on are what the mount bolts to... the long allen bolt thats with it goes through the chassis, and then you need two extra "through the chassis bolts" to finish off.
when i bought ours, i didnt actually realise i'd bought a drop plate rather than a -2" mount. took me a few minutes to work out what the hell was going on, so you're not alone ;)