g'day guys
just want to know where i can buy an aftermarket radiator cap for my evo 6.looks like original cap(1.1bar) and coolant is leaking into overflow tank.no leaks in radiator but cap looks like it is pretty well shot

 

I'd try eBay. For the mean time grab a generic rad cap from your auto parts store until you can find an OEM replacement, just make sure the cap is for a 1.1 bar and not a 0.9 bar.