Outer Limits 4x4 Board

Hey guys, i was wondering if any of you no what the maximum size coil spacer can be installed on standard suspension set up?

I am just after a cheap alternative while the tyres on my car wear out, before i buy my 30" with 3" lift :-)

Thanks guys

30mm rear 15 fronts

Cheers, This should get me out of trouble for a little while :-)