Hey guys i can get my hands on a set of new wheels quite cheap my only issue is trying to work out if the rears will actually fit on the car. I have koni adjustable shocks with eibach springs, and the rears are 17x9.5 +20 offset will be running either a 235 of 245 by 40 rear tire.
Any body had any experience in getting these to fit before??

It'll be pretty tight back there for a 17x9.5+20. most likely to poke out the guards a little.

Put the stats in here and see what it says, tick the box for visual representation that's super easy to understand:
 
http://mr2.gordaen.com/wt_calc.php

It will have plenty of clearance from the shocks/springs, but as Dylan said there will be a little bit of poke beyond the guards.

For reference, here's what a 9.5 +42 with 275 tyre looks like:

 
I had to roll the guards and trim some of the side moulding to stop it rubbing. Unless you ran some camber and some tyre stretch, it'll rub quite a lot. Inside clearance is fine though - I've got about 10mm inside clearance from memory.