Spare Tire Well Rust - Trunk Pan

Hi Folks,

I started cleaning up the rust inside my trunk yesterday on my 72' Duster and found a few holes (not the ones that chrysler put there intentionally). The rust had eaten through the sheet metal in the bottom of my spare tire well (underneath the keyhole brace in the center).

I guess at least a few of you have run into this with your A-Bodies, but I haven't found anything in the forums that discusses this particular issue.

1.) Can you purchase aftermarket replacement pans for the spare tire well? If so, where?
2.) If you cut out the rusted area and replace it, should you cut out the entire well or just the smallest section where you can elimnate the rust?

I'd like to hear how other people have delt with this particular issue.

Thanks,