I thought Extreme had the front bumper, the side sills are very similar, but if you do want the correct ones then you can get copies from prosport but they will need shortening slightly to fit. If I remember correctly, the rear bumper just has the flat strip under with strakes. You can either make these as I believe that one you mentioned has had done, or you can buy copies. The rest is things like carbon wrap, some bonnet pins (or make believe pins) dash tacho dial in yellow and a couple of rear screen supports (which all of the reps benefit from). Oh and some nice stripes and badges!
Main thing would be to get the different front bumper instead of the standard when you first buy the kit, then the rest can be added as you go along.