early eames vitra? 670 lounger in australia  

Well, jonnie, you've shown us
a chair that does look a lot like the Vitra version, but only views of the backs of the panels showing what would be referred to as backing or counter veneers not intended to be seen. HM only used the same specie as the face veneers for the backs, so I'd have to guess yours is a "rosewood", though it is lighter in color than some and, in some ways, almost resembles teak in the photos.
The "shock mounts" between the aluminum supports and back panels on later HM versions are hard plastic and could be more accurately called spacers or standoffs, IMO. Perhaps yours are similar?
There are various techniques and materials that might be employed to strengthen/repair cracked panels. It might be best left to an experienced restorer who can inspect the piece first-hand to advise appropriate alternatives.

here are some photo's of the...
here are some photo's of the back it doesn't look like the rosewood i have seen on other chairs maybe it isn't vitra maybe an australian company seeing as thats were i am located, it has the three screws for the armrests and is feather and foam filled, also does anyone know someone in australia who restores these chairs!

It doesn't look much like rosewood
versions I've seen, either. And the casting on the spider looks kinda rough compared to HM production. Now I'm a bit suspicious...

its definately not herman...
its definately not herman miller, maybe under licence by an australian firm, everything is exactly like a vitra model except the buttons look slightly bigger.

or maybe its by hille as a...
or maybe its by hille as a lot of english furniture ended up in australia