/ubbthreads/images/graemlins/uhh.gif I wouldn't reuse any of that cancer. You can probably find similar washers at a local hardware store.
I'm not sure if the front is the same as the rear but the bushing kit I got from JNZ came with new zinc coated washers (I think they were zinc coated, they had that shiny goldish color to them).
As a last resort you might be able to get non rusted washers from someone doing a part out. Or you could order that JNZ bushing kit for the front subframe and just use the washers.
Or there is always a local pick n pull yard. /ubbthreads/images/graemlins/dunno.gif