Wildside

I just bought a 1973 911 coupe that was a theft recovery from a local rebuildable company. Items stolen from this car include the wheels, glass and bumpers (the rest is intact). The engine is all there, but I don't know if it runs or not.

My question pertains to body kits. The body on this car is a little beaten, and since I got it dirt cheap, I figured I'd play with it a little. I have been looking at various websites that sell various body kits (wide bodies/turbo looks, etc.). It seems that most of the kits are stated to fit 74 and up vehicles, and mine is a 73. What are the major differences that prevent me from using these kits, and can I find kits that fit my body (where?)?